Document:

<PAGE>
                                                                    Exhibit 10.6

                             STOCKHOLDERS' AGREEMENT

     THIS STOCKHOLDERS' AGREEMENT (this "AGREEMENT") is made and entered into as
of this 27th day of September, 2005, by and among US Airways Group, Inc., a
Delaware corporation, and its successors (including, as the context may require,
on or after the effective date of the Plan, as reorganized pursuant to chapter
11 of the United States Bankruptcy Code) (the "COMPANY") and the purchasers of
the Company's Common Stock listed on Exhibit A hereto (the "INVESTORS").

                                    RECITALS

     WHEREAS, the Investors and certain other investors (the "OTHER INVESTORS")
are purchasing shares of the Company's common stock, par value $0.01 per share
(the "COMMON STOCK"), pursuant to those certain Investment Agreements (the
"INVESTMENT AGREEMENTS") as well as, in the case of Eastshore Aviation, LLC,
pursuant to that certain DIP Credit Facility, as amended, (collectively, the
"FINANCING");

     WHEREAS, the obligations in the Investors' Investment Agreement are
conditioned upon the execution and delivery of this Agreement;

     WHEREAS, the Company and each Other Investor is entering into a separate
Stockholder's Agreement in connection with the consummation of the Financing
(collectively, the "OTHER STOCKHOLDER AGREEMENTS"); and

     WHEREAS, in connection with the consummation of the Financing, the Company
and the Investors have agreed to the provisions as set forth below.

     NOW, THEREFORE, in consideration of these premises and intending to be
legally bound, the parties hereto agree as follows:

     1. CERTAIN DEFINITIONS. As used in this Agreement, the following terms
shall have the following respective meanings:

          "Affiliate" means, with respect to any specified Person, a Person that
directly, or indirectly through one or more intermediaries, controls, or is
controlled by, or is under common control with, the specified Person, where
"control" (including the terms "controlling," "controlled by" and "under common
control with") means the possession, directly or indirectly, of the power to
direct or cause the direction of the management and policies of such Person,
whether through the ownership of voting securities, by contract, or otherwise;
provided, however, that when used with respect to the Company, "Affiliate" shall
not include any Investor or Affiliate thereof.

          "Cases" shall mean the voluntary petitions for protection under
chapter 11 of the United States Bankruptcy Code filed by the Company and certain
of its subsidiaries in the United States Bankruptcy Court for the Eastern
District of Virginia, Alexandria Division to enable such debtors to be
restructured pursuant to one or more plans of reorganization.

<PAGE>

          "Closing Date" means the date of the closing of the purchase and sale
of Common Stock under the Investment Agreements.

          "Commission" means the Securities and Exchange Commission or any other
federal agency at the time administering the Securities Act.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
or any similar federal rule or statute and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.

          "Options" mean the options to purchase shares of Common Stock issued
to the Investors in the letter agreement dated September 16, 2005 and any such
options issued to any Other Investor and subsequently acquired by any of the
Investors.

          "Plan" shall mean the plan of reorganization to be filed in connection
with the Cases upon the Company's emergence from bankruptcy.

          "Preferred Stock" shall mean any series of preferred stock of the
Company issued in the future by the Company.

          "Registrable Securities" means any (i) Common Stock purchased by the
Investors pursuant to the Investors' Investment Agreement, including Common
Stock purchased pursuant to the Options, (ii) Common Stock of the Company, if
any, held by an Investor as of the date of this Agreement and (iii) Common Stock
issued or issuable in respect of any of the foregoing upon any stock split,
stock dividend, recapitalization or similar event; provided, however, that
securities shall only be treated as Registrable Securities if and so long as
they have not been sold pursuant to a registration or in accordance with Rule
144.

          The terms "register," "registered" and "registration" refer to a
registration effected by preparing and filing a registration statement in
compliance with the Securities Act, and the declaration or ordering of the
effectiveness of such registration statement.

          "Registration Expenses" shall mean all expenses, except as otherwise
stated below, incurred by the Company in complying with Section 6(a) and 6(c)
hereof, including without limitation, all registration, qualification and filing
fees, printing expenses, escrow fees, fees and disbursements of counsel for the
Company, blue sky fees and expenses, the expense of any special audits incident
to or required by any such registration (but excluding the compensation of
regular employees of the Company which shall be paid in any event by the Company
and excluding any underwriters discounts or commissions which may be
applicable). Registration Expenses shall also include the reasonable fees and
disbursements for one special counsel to the selling stockholders reasonably
acceptable to the Company.

          "Restricted Securities" shall mean the Common Stock purchased by the
Investors pursuant to the Investors' Investment Agreement, including the Common
Stock purchased pursuant to the Options, or any other securities issued in
respect of such stock upon any stock split, stock dividend, recapitalization,
merger or similar event until such Common Stock is sold pursuant to a
registration or until such Common Stock is sold or is eligible to be sold
pursuant to Rule 144, including pursuant to subsection (k) of Rule 144.

<PAGE>

          "Rule 144" and "Rule 145" shall mean Rules 144 and 145, respectively,
promulgated under the Securities Act, or any similar federal rules thereunder,
all as the same shall be in effect at the time.

          "Securities Act" shall mean the Securities Act of 1933, as amended, or
any similar federal rule or statute and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.

     2. RESTRICTIONS ON TRANSFERABILITY. The Common Stock and any other
securities issued in respect of such stock upon any stock split, stock dividend,
recapitalization, merger or similar event, shall not be sold, assigned,
transferred or pledged except upon the conditions specified in this Section 2
and in Section 4 of this Agreement, which conditions are intended to ensure
compliance with the provisions of the Securities Act. Each Investor or its
transferee will cause any proposed purchaser, assignee, transferee or pledgee of
any Restricted Securities held by the Investor or transferee to agree, if such
Securities would be Restricted Securities in the hands of such purchaser,
assignee, transferee or pledgee, to take and hold such securities subject to the
restrictions and upon the conditions specified in this Agreement.

     Without limiting the generality of the foregoing, each Investor agrees not
to sell any Common Stock prior to the date that is six (6) months after the
Closing Date; provided, that notwithstanding the foregoing, such Investor may
transfer any of its Common Stock (i) to the Company or (ii) to any of its
Affiliates or (iii) in a transaction involving a distribution without
consideration to its constituent partners or members in proportion to their
ownership interests in Investor, in each case so long as such Affiliate or
constituent partners or members agree in writing to be bound by the terms of
this Agreement and, if requested by the Company, such Investor's counsel
provides the Company with an opinion that such transfer is exempt from the
registration requirements of the Securities Act.

     3. RESTRICTIVE LEGEND. Each certificate representing Restricted Securities
shall (unless otherwise permitted by the provisions of Section 4 below) be
stamped or otherwise imprinted with legends in substantially the following form
(in addition to any legends required by applicable state securities laws):

          THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
          SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"). SUCH SECURITIES MAY
          NOT BE TRANSFERRED UNLESS A REGISTRATION STATEMENT UNDER THE ACT IS IN
          EFFECT AS TO SUCH TRANSFER OR SUCH TRANSFER MAY BE MADE PURSUANT TO
          RULE 144 OR ANOTHER EXEMPTION FROM THE ACT.

          THE SHARES REPRESENTED BY THE CERTIFICATE ARE SUBJECT TO CERTAIN
          RESTRICTIONS ON TRANSFER CONTAINED IN THE STOCKHOLDERS' AGREEMENT BY
          AND BETWEEN THE ISSUER AND THE ORIGINAL

<PAGE>

          HOLDER HEREOF, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL OFFICE
          OF THE ISSUER. SUCH RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE
          SHARES.

Each Investor consents to the Company making a notation on its records and
giving stop transfer instructions to any transfer agent of its capital stock in
order to implement the restrictions on transfer established in this Agreement.

     4. TRANSFER OF RESTRICTED SECURITIES.

               (A) NOTICE OF PROPOSED TRANSFERS. The holder of each certificate
     representing Restricted Securities by acceptance thereof agrees to comply
     in all respects with the provisions of this Section 4. Prior to any
     proposed sale, assignment, transfer or pledge of any Restricted Securities,
     unless there is in effect a registration statement under the Securities Act
     covering the proposed transfer, the holder thereof shall give written
     notice to the Company of such holder's intention to effect such transfer,
     sale, assignment or pledge. Each such notice shall describe the manner and
     circumstances of the proposed transfer, sale, assignment or pledge in
     sufficient detail, and, if requested by the Company, the holder shall also
     provide, at such holder's election and expense, either (i) a written
     opinion of legal counsel who shall be, and whose legal opinion shall be
     reasonably satisfactory to the Company, addressed to the Company, to the
     effect that the proposed transfer of the Restricted Securities may be
     effected without registration under the Securities Act, or (ii) a "no
     action" letter from the Commission to the effect that the transfer of such
     securities without registration will not result in a recommendation by the
     staff of the Commission that action be taken with respect thereto,
     whereupon the holder of such Restricted Securities shall be entitled to
     transfer such Restricted Securities in accordance with the terms of the
     notice delivered by the holder to the Company; provided, however, that no
     opinion of counsel or "no action" letter shall be required with respect to
     (i) a transfer not involving a change in beneficial ownership, (ii) a
     transaction involving the distribution without consideration of Restricted
     Securities by the holder to its constituent partners or members in
     proportion to their ownership interests in the holder, or (iii) a
     transaction involving the transfer without consideration of Restricted
     Securities by an individual holder during such holder's lifetime by way of
     gift or on death by will or intestacy. Each certificate evidencing the
     Restricted Securities transferred as above provided shall bear, except if
     such transfer is made pursuant to Rule 144, the appropriate restrictive
     legend set forth in Section 3 above, except that such certificate shall not
     bear such restrictive legend if in the opinion of counsel for such holder
     and counsel for the Company such legend is not required in order to
     establish compliance with any provision of the Securities Act.

               (B) REMOVAL OF LEGENDS. If any shares of Common Stock that were
     Restricted Securities become eligible for sale pursuant to Rule 144(k) or
     otherwise cease to be Restricted Securities, the Company shall, upon the
     request of the holder of such Common Stock, promptly remove the first
     legend set forth in Section 3 from the certificates for such Common Stock.
     At any time following the date that is six months after the Closing Date,
     the Company shall, upon the request of any Investor, promptly

<PAGE>

     remove the second legend set forth in Section 3 from any certificates
     representing shares of Common Stock.

     5. TRANSFER OF RIGHTS. The rights granted to the Investors or a permitted
transferee hereunder may be assigned to any transferee of any shares of Common
Stock, including any constituent partner or member of a holder which is a
partnership or limited liability company, or to an Affiliate of a holder which
is a corporation, partnership or limited liability company, provided that: (i)
such transfer is effected in accordance with applicable securities laws and the
terms of this Agreement; (ii) written notice is promptly given to the Company;
and (iii) such transferee or assignee agrees in writing to be bound by the
provisions of this Agreement.

     6. REGISTRATION RIGHTS.

          (A) COMPANY REGISTRATION. The Company shall (i) cause a shelf
registration statement on Form S-3 (or other appropriate form) covering the
resale of all of the Registrable Securities to be filed with the Commission
within forty-five (45) days after the Closing Date, (ii) cause such registration
statement to be declared effective by the Commission no later than six (6)
months after the Closing Date and (iii) keep such registration statement
continuously effective until the Investors no longer hold any Registrable
Securities that may not be sold either pursuant to (x) Rule 144(k) or (y) in
their entirety in a single transaction pursuant to Rule 144. The Company will
include in such registration (and any related qualifications including
compliance with blue sky laws), and in any underwriting involved therein, all
Registrable Securities specified by any Investor in a written request or
requests to the Company, made within ten days after the date of written notice
of such registration from the Company to the Investors.

     If the Company proposes to register any of its shares of Common Stock
(other than any registration for the account of the Company of securities issued
pursuant to any employee benefit plan or in any acquisition by the Company), the
Company will include in such registration all shares of Common Stock held by the
holders of Registrable Securities requested to be so included; provided,
however, that if, in the case of an underwritten offering, the managing
underwriter informs the Company that the number of shares of Registrable
Securities requested to be included in such offering by the Investors, together
with all Registrable Securities (as defined in the Other Stockholder Agreements)
requested to be included in such offering by the Other Investors pursuant to the
Other Stockholder Agreements (collectively, the "REQUESTED INVESTOR SHARES")
exceeds the amount which can be sold in such offering without adversely
affecting the distribution of the shares being offered, the Company shall
include, first, all of the shares the Company has proposed to register; second,
as many of the Requested Investor Shares, chosen pro rata based on the number of
Requested Investor Shares, as can be included without adversely affecting such
distribution; and, third, any other shares of Common Stock proposed to be
included in such offering. With respect to terms and conditions not provided for
in this paragraph or in this Section 6, the "piggyback" rights provided for in
this paragraph are intended to be on customary terms. Notwithstanding the
foregoing, this Section 6(a) shall not be applicable to (i) any registration
statements filed in connection with the registration of warrants to purchase
Common Stock issued by the Company on the date hereof, (ii) the Company's
Registration Statement on Form S-1 (File No. 333-126226) or (iii) any
registration statements filed in connection with the registration of Convertible
Notes being offered by the Company as contemplated by the preliminary offering
memorandum, dated September 20, 2005.

<PAGE>

          (B) EXPENSES OF REGISTRATION. All Registration Expenses incurred in
connection with the registration described in Section 6(a) shall be borne by the
Company. All other registration expenses, if any, (i) that are not directly
attributable to a single Investor shall be borne by the Investors and the Other
Investors pro rata on the basis of the number of shares so registered or
proposed to be so registered and (ii) that are directly attributable to a single
Investor shall be borne by such Investor.

          (C) REGISTRATION PROCEDURES. The Company will keep each Investor
advised in writing as to the initiation of the registration described in Section
6(a) and as to the completion thereof. The Company will:

               (I) Registration Statement. Prepare and file with the Commission
a registration statement with respect to such Registrable Securities and cause
such registration statement to become effective and remain effective, in each
case in accordance with the timeframes provided in Section 6(a).

               (II) Amendments and Supplements. Prepare and file with the
Commission such amendments and supplements to such registration statement and
the prospectus used in connection with such registration statement as may be
necessary to comply with the provisions of the Securities Act with respect to
the disposition of all securities covered by such registration statement for the
period set forth in Section 6(a) above.

               (III) Prospectus. Furnish to the Investors such number of copies
of the registration statement, any amendments thereto, any documents
incorporated by reference therein, a prospectus, including a preliminary
prospectus, in conformity with the requirements of the Securities Act, and such
other documents as they may reasonably request in order to facilitate the
disposition of Registrable Securities owned by them.

               (IV) Qualification. Use its reasonable best efforts to register
and qualify the securities covered by such registration statement under such
other securities or blue sky laws of such jurisdictions as shall be reasonably
requested by the Investors; provided that the Company shall not be required in
connection therewith or as a condition thereto to qualify to do business or to
file a general consent to service of process in any such states or
jurisdictions, unless the Company is already subject to service in such
jurisdiction and except as may be required by the Securities Act.

               (V) Underwriting Obligations. In the event of any underwritten
public offering of Registrable Securities, enter into and perform its
obligations under an underwriting agreement, in usual and customary form, with
the managing underwriter(s) of such offering. Each Investor participating in
such underwriting shall also enter into and perform its obligations under such
an underwriting agreement. The Company shall, if requested by the managing
underwriter or underwriters, if any, counsel to the Investors, or any holder of
Registrable Securities included in such offering, promptly incorporate in a
prospectus supplement or post-effective amendment such information as such
managing underwriter or underwriters, counsel to the Investors or any holder of
Registrable Securities reasonably requests to be included therein, and which is
reasonably related to the offering of such Registrable Securities, including,
without limitation, with respect to the Registrable Securities being sold by
such holder

<PAGE>

to such underwriter or underwriters, the purchase price being paid therefor by
such underwriter or underwriters and any other terms of an underwritten offering
of the Registrable Securities to be sold in such offering, and the Company shall
promptly make all required filings of such prospectus supplement or
post-effective amendment.

               (VI) Notice. Immediately notify each Investor holding Registrable
Securities covered by such registration statement at any time when a prospectus
relating thereto is required to be delivered under the Securities Act of the
happening of any event as a result of which the prospectus included in such
registration statement, as then in effect, includes an untrue statement of a
material fact or omits to state a material fact required to be stated therein or
necessary to make the statements therein not misleading in light of the
circumstances then existing (a "SUSPENSION NOTICE"); provided, however, that (i)
the Company shall not give more than two Suspension Notices during any period of
twelve consecutive months, (ii) any such Suspension Notice shall not be given
within 120 days of the end of the Suspension Notice period under the prior
Suspension Notice and (iii) in no event shall the period from the date on which
any holder of Registrable Securities receives a Suspension Notice until the date
on which such holder receives copies of the supplemented or amended prospectus
or is advised in writing by the Company that the use of the prospectus may be
resumed exceed for all Suspension Notices in the aggregate, 60 days in any 365
day period. The Company will use reasonable best efforts to promptly amend or
supplement such prospectus in order to cause such prospectus not to include any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein not misleading in
the light of the circumstances then existing.

               (VII) Listing. Cause all such Registrable Securities registered
pursuant hereto to be listed on each securities exchange or automated quotation
system on which similar securities issued by the Company are then listed or, if
no securities are then listed, on the NASDAQ Stock Market Inc.'s National Market
or on the New York Stock Exchange.

               (VIII) Transfer Agent; CUSIP Number. Provide a transfer agent and
registrar for all Registrable Securities registered pursuant hereunder and a
CUSIP number for all such Registrable Securities not later than the effective
date of such registration.

               (IX) Opinion, Comfort Letter. Cause to be furnished, on the date
that such Registrable Securities are delivered to the underwriters for sale, if
such securities are being sold through underwriters, (i) an opinion, dated as of
such date, of the counsel representing the Company for the purposes of such
registration, in form and substance as is customarily given to underwriters in
an underwritten public offering, addressed to the underwriters, if any, and (ii)
a letter dated as of such date, from the independent registered public
accountants of the Company, in form and substance as is customarily given by
independent certified public accountants to underwriters in an underwritten
public offering addressed to the underwriters.

               (X) Stop Orders. Use its reasonable best efforts to prevent the
issuance of any order suspending the effectiveness of a registration statement
relating to Registrable Securities, and if one is issued, use its best efforts
to obtain the withdrawal of any order suspending the effectiveness of such
registration statement at the earliest possible moment.

<PAGE>

               (XI) Company Records. Make available to each Investor, any
underwriter participating in any disposition pursuant to a registration
statement relating to Registrable Securities, and any attorney, accountant or
other agent or representative retained by any such Investor or underwriter
(collectively, the "INSPECTORS"), all financial and other records, pertinent
corporate documents and properties of the Company (collectively, the "Records")
reasonably necessary to enable them to exercise their due diligence
responsibility, and cause the Company's officers, directors and employees to
supply all information requested by any such Inspector in connection with such
registration statement, provided that each such Investor and each such Inspector
has entered into a customary confidentiality agreement with respect to such
Records.

               (XII) NASD Matters. Cooperate with each Investor and each
underwriter participating in the disposition of Registrable Securities and their
respective counsel in connection with any filings required to be made with the
National Association of Securities Dealers, Inc. ("NASD"), including, if
appropriate, the pre-filing of a prospectus as part of a registration statement
in advance of an underwritten offering.

          (D) INDEMNIFICATION.

               (I) Company Indemnification. The Company will indemnify each
holder (if Registrable Securities held by such holder are included in the
securities as to which such registration is being effected), each of its
officers and directors and partners, and each person controlling such holder
within the meaning of Section 15 of the Securities Act, with respect to which
registration has been effected pursuant to this Agreement, against all expenses,
claims, losses, damages or liabilities (or actions in respect thereof),
including any of the foregoing incurred in settlement of any litigation,
commenced or threatened, arising out of or based on any untrue statement (or
alleged untrue statement) of a material fact contained in any registration
statement, prospectus, offering circular or other document, or any amendment or
supplement thereto, incident to any such registration, or based on any omission
(or alleged omission) to state therein a material fact required to be stated
therein or necessary to make the statements therein, in light of the
circumstances in which they were made, not misleading, or any violation by the
Company of the Securities Act, the Exchange Act, state securities laws or any
rule or regulation promulgated under such laws applicable to the Company in
connection with any such registration, and the Company will reimburse each such
holder, each of its officers and directors, and each person controlling such
holder, for any legal and any other expenses reasonably incurred, as such
expenses are incurred, in connection with investigating, preparing or defending
any such claim, loss, damage, liability or action, provided that the Company
will not be liable in any such case to the extent that any such claim, loss,
damage, liability or expense arises out of or is based on any untrue statement
or omission or alleged untrue statement or omission made in reliance upon and in
conformity with written information furnished to the Company by an instrument
duly executed by such holder or controlling person, and stated to be
specifically for use therein; provided, further, that the indemnity agreement
contained in this subsection 6(d)(i) shall not apply to amounts paid in
settlement of any such loss, claim, damage, liability or action if such
settlement is effected without the consent of the Company (which consent shall
not be unreasonably withheld).

<PAGE>

               (II) Investor Indemnification. Each holder will, if Registrable
Securities held by such holder are included in the securities as to which such
registration is being effected, indemnify the Company, each of its directors and
officers, other holders of the Company's securities covered by such registration
statement, each person who controls the Company within the meaning of Section 15
of the Securities Act, and each such holder, each of its officers and directors
and each person controlling such holder within the meaning of Section 15 of the
Securities Act, against all claims, losses, damages and liabilities (or actions
in respect thereof) arising out of or based on any untrue statement (or alleged
untrue statement) of a material fact contained in any such registration
statement, prospectus, offering circular or other document, or any omission (or
alleged omission) to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, or any violation by
such holder of the Securities Act, the Exchange Act, state securities laws or
any rule or regulation promulgated under such laws applicable to such holder,
and will reimburse the Company, each such other holder, such directors,
officers, persons, underwriters or control persons for any legal or any other
expenses reasonably incurred, as such expenses are incurred, in connection with
investigating or defending any such claim, loss, damage, liability or action,
but in the case of the Company or such other holder or their officers, directors
or controlling persons, only to the extent that such untrue statement (or
alleged untrue statement) or omission (or alleged omission) is made in such
registration statement, prospectus, offering circular or other document in
reliance upon and in conformity with written information furnished to the
Company by an instrument duly executed by such holder and stated to be
specifically for use therein; provided, further, that the indemnity agreement
contained in this Subsection 6(d)(ii) shall not apply to amounts paid in
settlement of any such loss, claim, damage, liability or action if such
settlement is effected without the consent of such indemnifying holder (which
consent shall not be unreasonably withheld or delayed). The liability of any
holder for indemnification under this Section 6(d) in its capacity as a seller
of Registrable Securities shall not exceed the lesser of (i) that proportion of
the total of such losses, claims, damages, expenses or liabilities indemnified
against equal to the proportion of the total securities sold under such
registration statement by such holder, and (ii) the amount equal to the net
proceeds to such holder of the securities sold in any such registration.

               (III) Notice. Each party entitled to indemnification under this
Section 6(d) (the "INDEMNIFIED PARTY") shall give notice to the party required
to provide indemnification (the "INDEMNIFYING PARTY") promptly after such
Indemnified Party has actual knowledge of any claim as to which indemnity may be
sought, and shall permit the Indemnifying Party to assume the defense of any
such claim or any litigation resulting therefrom, provided that counsel for the
Indemnifying Party, who shall conduct the defense of such claim or litigation,
shall be approved by the Indemnified Party (whose approval shall not
unreasonably be withheld), and the Indemnified Party may participate in such
defense at such party's expense, and provided further that the failure of any
Indemnified Party to give notice as provided herein shall not relieve the
Indemnifying Party of its obligations under this Agreement unless the failure to
give such notice is materially prejudicial to an Indemnifying Party's ability to
defend such action and provided further, that the Indemnifying Party shall not
assume the defense for matters as to which there is a conflict of interest or
there are separate and different defenses. No Indemnifying Party, in the defense
of any such claim or litigation, shall, except with the consent of each
Indemnified Party (whose consent shall not be unreasonably withheld), consent to
entry of any judgment or enter into any settlement which does not include as an
unconditional term thereof the giving by the

<PAGE>

claimant or plaintiff to such Indemnified Party of a release from all liability
in respect to such claim or litigation.

               (IV) Contribution. If the indemnification provided for in this
Section 6(d) is held by a court of competent jurisdiction to be unavailable to
an Indemnified Party with respect to any losses, claims, damages or liabilities
referred to herein, the Indemnifying Party, in lieu of indemnifying such
Indemnified Party thereunder, shall to the extent permitted by applicable law
contribute to the amount paid or payable by such Indemnified Party as a result
of such loss, claim, damage or liability in such proportion as is appropriate to
reflect the relative fault of the Indemnifying Party on the one hand and of the
Indemnified Party on the other in connection with the untrue statement or
omission that resulted in such loss, claim, damage or liability, as well as any
other relevant equitable considerations. The relative fault of the Indemnifying
Party and of the Indemnified Party shall be determined by a court of law by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or the omission to state a material fact relates to
information supplied by the Indemnifying Party or by the Indemnified Party and
the parties' relative intent, knowledge, access to information and opportunity
to correct or prevent such statement or omission; provided, that in no event
shall any contribution by an Investor hereunder exceed the proceeds from the
offering received by such Investor.

               (V) Survival. The obligations of the Company and the Investors
under this Section 6(d) shall survive completion of any offering of Registrable
Securities in a registration statement and the termination of this agreement.
The provisions of this Section 6(d) shall survive any termination of this
Agreement.

          (E) INFORMATION BY INVESTOR. The Investor or Investors holding
Registrable Securities included in any registration shall furnish to the Company
such information regarding such Investor or Investors, the Registrable
Securities held by them and the distribution proposed by such Investor or
Investors as the Company may request in writing and as shall be required in
connection with any registration referred to in this Agreement.

          (F) RULE 144 REPORTING. With a view to making available the benefits
of certain rules and regulations of the Commission which may at any time permit
the sale of the Restricted Securities to the public without registration, the
Company agrees to use reasonable best efforts to:

               (I) Public Information. Make and keep public information
available, as those terms are understood and defined in Rule 144 under the
Securities Act;

               (II) Filing. File with the Commission in a timely manner all
reports and other documents required of the Company under the Securities Act and
the Exchange Act; and

               (III) Rule 144 Statement. So long as an Investor owns any
Restricted Securities, to furnish to such Investor forthwith upon request a
written statement by the Company as to its compliance with the reporting
requirements of said Rule 144 (at any time after 90 days after the effective
date of the first registration statement filed by the Company for an

<PAGE>

offering of its securities to the general public), a copy of the most recent
annual or quarterly report of the Company, and such other reports and documents
of the Company and other information in the possession of or reasonably
obtainable by the Company as such Investor may reasonably request in availing
itself of any rule or regulation of the Commission allowing such Investor to
sell any such securities without registration.

          (G) DELAY FEE. If: (i) any registration statement required to be filed
pursuant to Section 6(a) is not filed within the time period specified therein,
(ii) a registration statement filed hereunder is not declared effective by the
SEC within the time period specified in Section 6(a) or (iii) a registration
statement ceases to be effective and available for resales of Registrable
Securities by Investors when the Company is required to keep such registration
statement effective under this Agreement, (any such failure or breach being
referred to as a "REGISTRATION DEFAULT" and, for purposes of clause (i), (ii) or
(iii), the date on which such Registration Default occurs, being referred to as
an "EVENT DATE"), then, in addition to, and not in lieu or limitation of, any
other remedies the Investors may have in law (including damages) or equity, the
Company shall pay to each Investor an amount, in cash ("RD FEES") (x) upon the
occurrence of a Registration Default, an amount equal to $0.165 for each
Registrable Security then held by such Investor, and (y) if the Registration
Default has not been cured by the first month anniversary following the date of
the Registration Default, an amount equal to $0.165 for each Registrable
Security then held by such Investor, and (z) on each monthly anniversary
thereafter until the Registration Default has been cured, an amount equal to
$0.165 for each Registrable Security then held by such Investor; provided,
however, that all periods referred to in clauses (y) and (z) above shall be
tolled in respect of any Investor during delays caused by the action or inaction
of such Investor, and the Company shall have no liability to such Investor in
respect of any such delay. The RD Fees payable pursuant hereto shall be payable
within five (5) business days following the date of the Registration Default or
the monthly anniversary thereof, as the case may be. Notwithstanding anything to
the contrary contained herein, RD Fees shall not be payable under this Section
6(g) for more than one Registration Default occurring or existing at any one
time.

     7. INTENTIONALLY OMITTED.

     8. AMENDMENT. Except as otherwise provided herein, additional parties may
be added to this Agreement and any provision of this Agreement may be amended or
the observance thereof may be waived (either generally or in a particular
instance and either retroactively or prospectively), only with the written
consent of the Company and each Investor. Any amendment or waiver effected in
accordance with this Section 8 shall be binding upon each Investor, any
transferee thereof and the Company. So long as the Investors and/or their
permitted transferees who become parties to and bound by this Agreement
collectively hold not less than 10% of the number of shares of Common Stock
acquired by the Investors pursuant to the Investors' Investment Agreement, the
Company shall not amend or waive any provision of any Other Stockholder
Agreement except with the prior written consent of the Investors.

     9. GOVERNING LAW. This Agreement shall be governed in all respects by the
internal laws of the State of Delaware without regard to conflict of laws
provisions.

<PAGE>

     10. ENTIRE AGREEMENT. This Agreement constitutes the full and entire
understanding and Agreement among the parties regarding the matters set forth
herein. Except as otherwise expressly provided herein, the provisions hereof
shall inure to the benefit of, and be binding upon the successors, assigns,
heirs, executors and administrators of the parties hereto.

     11. SEVERABILITY. The provisions of this Agreement are severable and the
invalidity or unenforceability of any provision will not affect the validity or
enforceability of the other provisions of this Agreement. If any provision of
this Agreement, or the application of that provision to any Person or any
circumstance, is invalid or unenforceable, (a) a suitable and equitable
provision will be substituted for that provision in order to carry out, so far
as may be valid and enforceable, the intent and purpose of the invalid or
unenforceable provision and (b) the remainder of this Agreement and the
application of that provision to other Persons or circumstances will not be
affected by such invalidity or unenforceability, nor will such invalidity or
unenforceability affect the validity or enforceability of that provision, or the
application of that provision, in any other jurisdiction.

     12. SUCCESSORS AND ASSIGNS. Except as otherwise expressly provided herein,
the provisions hereof shall inure to the benefit of, and be binding upon, the
Company's and the Investors' successors, assigns and transferees, including,
without limitation and without the need for an express assignment, subsequent
holders of Registrable Securities; provided that such assignee or transferee is
not a "major airline" or "low cost carrier", as such terms are commonly
understood in the airline industry, or an Affiliate thereof. If any assignee or
transferee of Investor shall acquire Registrable Securities in any manner,
whether by operation of law or otherwise, such Registrable Securities shall be
held subject to all of the terms of this Agreement, and by taking and holding
such Registrable Securities such person shall be deemed to have agreed to be
bound by and to perform all of the terms and provisions of this Agreement and
such person shall be entitled to receive the benefits hereof.

     13. NOTICES, ETC. All notices and other communications required or
permitted hereunder shall be in writing and shall be mailed by registered or
certified mail, postage prepaid, or otherwise delivered by facsimile
transmission, by hand or by messenger, addressed:

          (A) STOCKHOLDER. If to an Investor, at such Investor's address as set
forth in either Exhibit A, or at such other address as such Investor shall have
furnished to the Company.

          (B) COMPANY. If to the Company, to:

               US Airways Group, Inc.
               111 West Rio Salado Parkway
               Tempe, AZ 85281
               Attention: General Counsel
               Telecopy No. 480-693-5155

               or at such other address as the Company shall have furnished to
               the Investors.

<PAGE>

Each such notice or other communication shall for all purposes of this Agreement
be treated as effective or having been given when delivered if delivered
personally, if sent by facsimile, the first business day after the date of
confirmation that the facsimile has been successfully transmitted to the
facsimile number for the party notified, or, if sent by mail, at the earlier of
its receipt or 72 hours after the same has been deposited in a regularly
maintained receptacle for the deposit of the United States mail, addressed and
mailed as aforesaid.

     14. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be an original and all of which together shall
constitute one instrument.

     15. OWNERSHIP. Each Investor represents and warrants to the other Investors
and the Company that (a) such Investor now owns the Common Stock, free and clear
of liens or encumbrances, and has not, prior to or on the date of this
Agreement, executed or delivered any proxy or entered into any other voting
agreement or similar arrangement other than one which has expired or terminated
prior to the date hereof, and (b) such Investor has full power and capacity to
execute, deliver and perform this Agreement, which has been duly executed and
delivered by, and evidences the valid and binding obligation of, such Investor
enforceable in accordance with its terms.

     16. SPECIFIC PERFORMANCE. The parties hereto specifically acknowledge that
monetary damages are not an adequate remedy for violations of this Agreement,
and that any party hereto may, in its sole discretion, apply to a court of
competent jurisdiction for specific performance or injunctive or such other
relief as such court may deem just and proper in order to enforce this Agreement
or prevent any violation hereof and, to the extent permitted by applicable law
and to the extent the party seeking such relief would be entitled to the merits
to obtain such relief, each party waives any objection to the imposition of such
relief.

     17. DESIGNATION OF FORUM AND CONSENT TO JURISDICTION. The parties hereto
(i) designate the courts of the State of Delaware as the forum where all matters
pertaining to this Agreement may be adjudicated, and (ii) by the foregoing
designation, consent to the exclusive jurisdiction and venue of such courts for
the purpose of adjudicating all matters pertaining to this Agreement.

     18. WAIVER OF JURY TRIAL. EACH OF THE PARTIES HERETO WAIVES ANY RIGHT IT
MAY HAVE TO HAVE A JURY PARTICIPATE IN RESOLVING ANY DISPUTE ARISING OUT OF OR
RELATED TO THIS AGREEMENT. INSTEAD, ANY SUCH DISPUTES RESOLVED IN COURT SHALL BE
RESOLVED IN A BENCH TRIAL WITHOUT A JURY.

     19. STOCK SPLIT. All references to numbers of shares in this Agreement
shall be appropriately adjusted to reflect any stock dividend, split,
combination or other recapitalization of shares by the Company occurring after
the date of this Agreement.

                             [Signatures Next Page]

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Stockholders'
Agreement as of the date first set forth above.

                                        US AIRWAYS GROUP, INC.

                                        By:
                                            -----------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        TUDOR INVESTMENT CORPORATION, AS
                                        INVESTMENT ADVISER TO EACH INVESTOR
                                        LISTED ON SCHEDULE 1 OF ITS INVESTMENT
                                        AGREEMENT, DATED JULY 7, 2005 (OTHER
                                        THAN TUDOR PROPRIETARY TRADING, L.L.C.)

                                        By:
                                            ------------------------------------
                                        Name: William T. Flaherty
                                        Title: Managing Director

                                        TUDOR PROPRIETARY TRADING, L.L.C.

                                        By:
                                            ------------------------------------
                                        Name: William T. Flaherty
                                        Title: Managing Director

<PAGE>

                                    EXHIBIT A

                                    INVESTORS

                                                         SHARES PURCHASED ON THE
NAME AND ADDRESS                                             CLOSING DATE(1)
-------------------------------------                    -----------------------
Tudor Proprietary Trading, L.L.C. and
certain investors for which Tudor                               3,939,394
Investment Corporation acts as
investment adviser, as listed on                         (total shares owned by
Schedule 1 of the Investment                             all investors listed on
Agreement dated July 7, 2005                             Schedule 1 of the

1275 King Street                                         Investment Agreement
Greenwich, Connecticut 06831                             dated July 7, 2005)
Fax: (203) 552-8400
Attention: Mr. Stephen N. Waldman

With a copy to:

Boies, Schiller & Flexner LLP
570 Lexington Avenue
16th Floor
New York, New York 10022
Fax: (212) 446-2350
Attention: George Y. Liu, Esq.

----------
(1)  Pursuant to the Investors' Investment Agreement, as amended by the certain
     letter agreement dated as of September 16, 2005, the Investors each have
     the option to purchase additional shares of Common Stock (and Investors may
     acquire similar options from Other Investors), which will not be exercised
     until after the Closing Date. Therefore, any shares of Common Stock that
     Investors may receive pursuant to these options are not reflected in this
     Exhibit A.

                                       1<PAGE>
                                                                     Exhibit 4.1

================================================================================

                             US AIRWAYS GROUP, INC.

                      7% SENIOR CONVERTIBLE NOTES DUE 2020

                                   ----------

                                    INDENTURE

                         DATED AS OF SEPTEMBER 30, 2005

                                   ----------

                         U.S. BANK NATIONAL ASSOCIATION

                                   AS TRUSTEE

                                US AIRWAYS, INC.
                           AMERICA WEST AIRLINES, INC.

                                  AS GUARANTORS

================================================================================

<PAGE>

CROSS-REFERENCE TABLE*

<TABLE>
<CAPTION>
          TIA SECTION            INDENTURE SECTION
------------------------------   -----------------
<S>                              <C>
Section 310(a)(1)                8.10
           (a)(2)                8.10
           (a)(3)                N.A.
           (a)(4)                N.A.
           (a)(5)                8.10
           (b)                   8.8; 8.10; 11.2
           (c)                   N.A.
Section 311(a)                   8.11
           (b)                   8.11
           (c)                   N.A.
Section 312(a)                   2.5
           (b)                   12.3
           (c)                   12.2
Section 313(a)                   8.6
           (b)(1)                N.A.
           (b)(2)                8.6
           (c)                   8.6; 12.2
           (d)                   8.6
Section 314(a)                   5.2; 5.4; 12.2
           (b)                   N.A.
           (c)(1)                12.4(a)
           (c)(2)                12.4(a)
           (c)(3)                N.A.
           (d)                   N.A.
           (e)                   12.4(b)
           (f)                   N.A.
Section 315(a)                   8.1(b)
           (b)                   8.5; 12.2
           (c)                   8.1(a)
           (d)                   8.1(c)
           (e)                   7.12
Section 316(a) (last sentence)   2.9
           (a)(1)(A)             7.6
           (a)(1)(B)             7.4
           (a)(2)                N.A.
           (b)                   7.8
           (c)                   12.5
Section 317(a)(1)                7.9
           (a)(2)                7.10
           (b)                   2.4
Section 318(a)                   12.1
</TABLE>

----------
*    This Cross-Reference Table shall not, for any purpose, be deemed a part of
     this Indenture.

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
                               ARTICLE 1

               DEFINITIONS AND INCORPORATION BY REFERENCE

Section 1.1.   Definitions.............................................     1
Section 1.2.   Other Definitions.......................................     6
Section 1.3.   Trust Indenture Act Provisions..........................     7
Section 1.4.   Rules of Construction...................................     7

                                 ARTICLE 2

                              THE SECURITIES

Section 2.1.   Form and Dating.........................................     8
Section 2.2.   Execution and Authentication............................     9
Section 2.3.   Registrar, Paying Agent and Conversion Agent............    10
Section 2.4.   Paying Agent to Hold Money in Trust.....................    10
Section 2.5.   Holder Lists............................................    10
Section 2.6.   Transfer and Exchange...................................    11
Section 2.7.   Replacement Securities..................................    11
Section 2.8.   Outstanding Securities..................................    12
Section 2.9.   Treasury Securities.....................................    13
Section 2.10.  Temporary Securities....................................    13
Section 2.11.  Cancellation............................................    13
Section 2.12.  Legend; Additional Transfer and Exchange Requirements...    13
Section 2.13.  CUSIP Numbers...........................................    15
Section 2.14.  Senior Unsecured Obligations............................    16
Section 2.15.  Calculations Regarding the Securities...................    16

                               ARTICLE 3

                       REDEMPTION AND REPURCHASES

Section 3.1.   Company's Rights to Redeem; Notice to Trustee...........    16
Section 3.2.   Selection of Securities to Be Redeemed..................    16
Section 3.3.   Notice of Redemption....................................    17
Section 3.4.   Effect of Notice of Redemption..........................    18
Section 3.5.   Deposit of Redemption Price.............................    18
Section 3.6.   Securities Redeemed in Part.............................    18
Section 3.7.   Repurchase of Securities at the Option of Holders on
                  Specific Dates.......................................    18
Section 3.8.   Repurchase of Securities at Option of the Holder upon
                  a Fundamental Change.................................    21
Section 3.9.   Company Purchases of Securities.........................    24
Section 3.10.  Repayment to the Company................................    24
Section 3.11.  Compliance with Securities Laws.........................    25
Section 3.12.  Election to Pay Purchase Price in Common Stock..........    25
</TABLE>

                                       -i-

<PAGE>

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
                               ARTICLE 4

                               CONVERSION

Section 4.1.   Conversion Right........................................    26
Section 4.2.   Exercise of Conversion Right............................    26
Section 4.3.   Company's Right to Elect to Pay Cash or Common Stock....    27
Section 4.4.   Fractions of Shares.....................................    27
Section 4.5.   Conversion Procedure....................................    27
Section 4.6.   Adjustment of Conversion Rate...........................    27
Section 4.7.   Notice of Adjustment....................................    32
Section 4.8.   Consolidation or Merger of the Company..................    33
Section 4.9.   Taxes on Conversion.....................................    34
Section 4.10.  Conversion After Record Date............................    34
Section 4.11.  Company Determination Final.............................    34
Section 4.12.  Responsibility of Trustee for Conversion Provisions.....    34
Section 4.13.  Unconditional Right of Holders to Convert...............    35
Section 4.14.  Repayment to the Company................................    35
Section 4.15.  Make-Whole Premium......................................    35

                               ARTICLE 5

                               COVENANTS

Section 5.1.   Payment of Securities...................................    36
Section 5.2.   SEC Reports.............................................    37
Section 5.3.   Compliance Certificates.................................    37
Section 5.4.   Further Instruments and Acts............................    37
Section 5.5.   Maintenance of Corporate Existence......................    37
Section 5.6.   Rule 144A Information Requirement.......................    37
Section 5.7.   Stay, Extension and Usury Laws..........................    38
Section 5.8.   Payment of Liquidated Damages...........................    38

                               ARTICLE 6

          CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

Section 6.1.   Company May Consolidate, Etc., Only On Certain Terms....    38
Section 6.2.   Successor Substituted...................................    39
Section 6.3.   Guarantor May Consolidate, Etc., Only on Certain Terms..    39

                               ARTICLE 7

                          DEFAULT AND REMEDIES

Section 7.1.   Events of Default.......................................    39
Section 7.2.   Acceleration............................................    41
Section 7.3.   Other Remedies..........................................    42
Section 7.4.   Waiver of Defaults and Events of Default................    42
Section 7.5.   Waiver of Compliance....................................    42
Section 7.6.   Control by Majority.....................................    42
</TABLE>

                                      -ii-

<PAGE>

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
Section 7.7.   Limitations on Suits....................................    42
Section 7.8.   Collection Suit by Trustee..............................    43
Section 7.9.   Trustee May File Proofs of Claim........................    43
Section 7.10.  Priorities..............................................    43
Section 7.11.  Undertaking for Costs...................................    44

                               ARTICLE 8

                                TRUSTEE

Section 8.1.   Duties of Trustee.......................................    44
Section 8.2.   Rights of Trustee.......................................    45
Section 8.3.   Individual Rights of Trustee............................    46
Section 8.4.   Trustee's Disclaimer....................................    46
Section 8.5.   Notice of Default or Events of Default..................    46
Section 8.6.   Reports by Trustee to Holders...........................    47
Section 8.7.   Compensation and Indemnity..............................    47
Section 8.8.   Replacement of Trustee..................................    48
Section 8.9.   Successor Trustee by Merger, Etc........................    48
Section 8.10.  Eligibility; Disqualification...........................    49
Section 8.11.  Preferential Collection of Claims Against Company.......    49

                               ARTICLE 9

                SATISFACTION AND DISCHARGE OF INDENTURE

Section 9.1.   Satisfaction and Discharge of Indenture.................    49
Section 9.2.   Application of Trust Money..............................    50
Section 9.3.   Repayment to Company....................................    50
Section 9.4.   Reinstatement...........................................    50

                               ARTICLE 10

                  AMENDMENTS, SUPPLEMENTS AND WAIVERS

Section 10.1.  Without Consent of Holders..............................    51
Section 10.2.  With Consent of Holders.................................    52
Section 10.3.  Compliance with Trust Indenture Act.....................    53
Section 10.4.  Revocation and Effect of Consents.......................    53
Section 10.5.  Notation on or Exchange of Securities...................    53
Section 10.6.  Trustee to Sign Amendments, Etc.........................    54
Section 10.7.  Effect of Supplemental Indentures.......................    54

                                ARTICLE 11

                                GUARANTEES

Section 11.1.  Guarantees..............................................    54
Section 11.2.  Severability............................................    55
Section 11.3.  Priority of Guarantees..................................    55
Section 11.4.  Limitation of Guarantors' Liability.....................    56
</TABLE>

                                      -iii-

<PAGE>

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
Section 11.5.  Subrogation.............................................    56
Section 11.6.  Reinstatement...........................................    56
Section 11.7.  Release of the Guarantor................................    56
Section 11.8.  Benefits Acknowledged...................................    56

                               ARTICLE 12

                             MISCELLANEOUS

Section 12.1.  Trust Indenture Act Controls............................    57
Section 12.2.  Notices.................................................    57
Section 12.3.  Communications by Holders with Other Holders............    58
Section 12.4.  Certificate and Opinion as to Conditions Precedent......    58
Section 12.5.  Record Date for Vote or Consent of Holders..............    58
Section 12.6.  Rules by Trustee, Paying Agent, Registrar and
                  Conversion Agent.....................................    59
Section 12.7.  Legal Holidays..........................................    59
Section 12.8.  Governing Law...........................................    59
Section 12.9.  No Adverse Interpretation of Other Agreements...........    59
Section 12.10. No Recourse Against Others..............................    59
Section 12.11. Successors..............................................    59
Section 12.12. Multiple Counterparts...................................    59
Section 12.13. Separability............................................    59
Section 12.14. Table of Contents, Headings, Etc........................    60

Exhibit A  -  Form of Note
Exhibit B  -  Assignment Form
Exhibit C  -  Form of Certificate of Transfer
Exhibit D  -  Form of Guarantee
</TABLE>

                                      -iv-

<PAGE>

     THIS INDENTURE dated as of September 30, 2005 is between US Airways Group,
Inc., a Delaware corporation (the "Company"), the guarantors executing a
signature page hereto (each a "Guarantor" and collectively the "Guarantors") and
U.S. Bank National Association, a national banking association organized and
existing under the laws of the United States, as Trustee (the "Trustee").

     In consideration of the premises herein and the purchase of the Securities
by the Holders thereof, the parties agree as follows for their mutual benefit
and for the equal and ratable benefit of the registered Holders of the Company's
7% Senior Convertible Notes due 2020.

                                    ARTICLE 1

                   DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.1. DEFINITIONS.

     "Affiliate" means, with respect to any specified person, any other person
directly or indirectly controlling or controlled by or under direct or indirect
common control with such specified person. For the purposes of this definition,
"control" when used with respect to any person means the power to direct the
management and policies of such person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise; and the terms
"controlling" and "controlled" have meanings correlative to the foregoing.

     "Agent" means any Registrar, Paying Agent or Conversion Agent.

     "Applicable Procedures" means, with respect to any transfer or exchange of
beneficial ownership interests in a Global Security, the rules and procedures of
the Depositary, in each case to the extent applicable to such transfer or
exchange.

     "Board of Directors" means either the board of directors of the Company or
any committee of the Board of Directors authorized to act for it with respect to
this Indenture.

     "Business Day" means each day on which the New York Stock Exchange is open
for trading.

     "Capital Stock" of any Person means any and all shares, interests, rights
to purchase, warrants, options, participations or other equivalents of or
interests in (however designated) equity of such Person, but excluding any debt
securities convertible into such equity.

     "Certificated Security" means a Security that is in substantially the form
attached hereto as Exhibit A and that does not include the information or the
schedule called for by footnotes 1 and 2 thereof.

     "Change in Control" means the occurrence of any of the following events:

          (i) any "person" or "group" within the meaning of Sections 13(d) and
     14(d)(2) of the Exchange Act or any successor provision to either of the
     foregoing, including any group acting for the purpose of acquiring, holding
     or disposing of securities within the meaning of Rule 13d-5(b)(1) under the
     Exchange Act, becomes the "beneficial owner," as defined in Rule 13d-3
     under the Exchange Act, directly or indirectly, through a purchase, merger
     or other acquisition transaction, of 50% or more of the total voting power
     of the Company's total outstanding Voting Stock, other than an acquisition
     by the Company, any of its subsidiaries or any of its subsidiaries' or the
     Company's employee benefit plans;

<PAGE>

          (ii) the Company consolidates with, or merges with or into, another
     person or conveys, transfers, leases or otherwise disposes of all or
     substantially all of its assets to any person, or any person consolidates
     with or merges with or into the Company, other than (x) any transaction (A)
     that does not result in any reclassification, exchange or cancellation of
     outstanding shares of the Company's Capital Stock and (B) pursuant to which
     holders of the Company's Capital Stock immediately prior to the transaction
     have the entitlement to exercise, directly or indirectly, 50% or more of
     the total Voting Power of all shares of the Company's Capital Stock
     entitled to vote generally in the election of directors of the continuing
     or surviving person immediately after the transaction; or (y) any merger
     solely for the purpose of changing jurisdiction of formation and resulting
     in a reclassification or conversion of outstanding shares of Common Stock
     solely into shares of common stock of the surviving entity; or

          (iii) the Company approves a plan of liquidation or dissolution.

     Notwithstanding the foregoing, it will not constitute a Change in Control
if the consideration for the Common Stock (excluding cash payments for
fractional shares and cash payments made in respect of dissenters' appraisal
rights) in the transaction or transactions constituting the Change in Control
consists of common stock or American Depositary Shares representing shares of
common stock traded on a U.S. national securities exchange or quoted on the
Nasdaq National Market, or which will be so traded or quoted when issued or
converted in connection with the Change in Control, and as a result of such
transaction or transactions the Securities become convertible into such common
stock or American Depositary Shares representing shares of common stock.

     "Closing Price" means the price of a share of Common Stock on the relevant
date, determined (a) on the basis of the reported last sale price per share (or,
if no last sale price is reported, the average of the bid and ask prices per
share or, if more than one in either case, the average of the average bid and
the average ask prices per share) on such date reported by the New York Stock
Exchange or, if the Common Stock is not reported by the New York Stock Exchange,
as reported by the principal national securities conversion or quotation system
on which the Common Stock is then listed; or (b) if the Common Stock is not
listed on a national securities exchange, as reported by the National
Association of Securities Dealers Automated Quotation System; or (c) if not so
quoted, as reported by National Quotation Bureau, Incorporated or similar
organization. In the absence of such a quotation or report, the Closing Price
shall be such price as the Board of Directors shall reasonably determine on the
basis of such quotations as most accurately reflecting the price that a fully
informed buyer, acting on his own accord, would pay to a fully informed seller,
acting on his own accord in an arm's-length transaction, for a share of such
Common Stock.

     "Common Stock" means the common stock of the Company, par value $0.01 per
share, as it exists on the date of this Indenture and any shares of any class or
classes of capital stock of the Company resulting from any reclassification or
reclassifications thereof and which have no preference in respect of dividends
or of amounts payable in the event of any voluntary or involuntary liquidation,
dissolution or winding-up of the Company and which are not subject to redemption
by the Company; provided, however, that if at any time there shall be more than
one such resulting class, the shares of each such class then so issuable on
exchange of Securities shall be substantially in the proportion which the total
number of shares of such class resulting from all such reclassifications bears
to the total number of shares of all such classes resulting from all such
reclassifications.

     "Company" means the party named as such in the first paragraph of this
Indenture until a successor replaces it pursuant to the applicable provisions of
this Indenture, and thereafter "Company" shall mean such successor Company.

                                       -2-

<PAGE>

     "Conversion Date" means, with respect to any Holder, the date on which such
Holder has satisfied all the requirements to convert its Securities as described
in Section 4.2 hereof.

     "Conversion Price" means, at any time, $1,000 divided by the Conversion
Rate in effect at such time rounded to two decimal places (rounded up if the
third decimal place thereof is 5 or more and otherwise rounded down).

     "Conversion Rate" means the rate at which shares of Common Stock shall be
delivered upon conversion, which rate shall be initially 41.4508 shares of
Common Stock for each $1,000 principal amount of Securities, as adjusted from
time to time pursuant to the provisions of this Indenture.

     "Corporate Trust Office" means the office of the Trustee at which at any
particular time the trust created by this Indenture shall be administered, which
office at the date of the execution of this Indenture is located at U.S. Bank
National Association, 60 Livingston Avenue, EP-MN-WS3C, St. Paul, MN 55107-2292,
Attention: Raymond Haverstock, or at any other time at such other address as the
Trustee may designate from time to time by notice to the Company.

     "Default" or "default" means, when used with respect to the Securities, any
event which is or, after notice or passage of time or both, would be an Event of
Default.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations promulgated thereunder, as in effect from time to
time.

     "Ex-Dividend Date" means, with respect to any distribution on shares of
Common Stock, the first date on which the shares of Common Stock trade regular
way on the principal securities market on which the shares of Common Stock are
then traded without the right to receive such distribution.

     "Final Maturity Date" means September 30, 2020.

     "Fundamental Change" means the occurrence of either a Change in Control or
a Termination of Trading.

     "Fundamental Change Effective Date" means the date on which a Fundamental
Change becomes effective.

     "GAAP" means generally accepted accounting principles in the United States
of America as in effect from time to time, including those set forth in (1) the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants, (2) the statements and pronouncements
of the Financial Accounting Standards Board, (3) such other statements by such
other entity as approved by a significant segment of the accounting profession
and (4) the rules and regulations of the SEC governing the inclusion of
financial statements (including pro forma financial statements) in registration
statements filed under the Securities Act and periodic reports required to be
filed pursuant to Section 13 of the Exchange Act, including opinions and
pronouncements in staff accounting bulletins and similar written statements from
the accounting staff of the SEC.

     "Global Security" means a permanent Global Security that is in
substantially the form attached hereto as Exhibit A and that includes the
information and schedule called for by footnote 1 thereof and which is deposited
with the Depositary or its custodian and registered in the name of the
Depositary or its nominee.

                                       -3-

<PAGE>

     "Guarantee" means any guarantee of the Securities by any Subsidiary in
accordance with the provisions of Article 11 and their respective successors and
assigns.

     "Guarantors" means the Subsidiaries party to this Indenture.

     "Holder" means the person in whose name a Security is registered on the
Primary Registrar's books.

     "Indenture" means this Indenture as amended or supplemented from time to
time pursuant to the terms of this Indenture.

     "Initial Purchaser" means Merrill Lynch, Pierce, Fenner & Smith
Incorporated.

     "Issuance Date" means the date on which the Securities are first
authenticated and issued.

     "Liquidated Damages" has the meaning specified in paragraph 3 of the
Security.

     "Officer" means the Chairman or any Co-Chairman of the Board, any Vice
Chairman of the Board, the Chief Executive Officer, the President, any Vice
President, the Chief Financial Officer, the Controller, the Secretary, the
Treasurer or any Assistant Controller or Assistant Secretary of the Company.

     "Officers' Certificate" means a certificate signed by the principal
executive officer, principal financial officer or principal accounting officer
of the Company and by one other Officer.

     "Opinion of Counsel" means a written opinion from legal counsel. The
counsel may be an employee of, or counsel to, the Company or the Trustee.

     "Person" or "person" means any individual, corporation, partnership,
limited liability company, joint venture, association, joint-stock company,
trust, unincorporated organization, government or any agency or political
subdivision thereof or any syndicate or group that would be deemed to be a
person under Section 13(d)(3) of the Exchange Act or any other entity.

     "Principal" or "principal" of a debt security, including the Securities,
means the principal of the security plus, when appropriate, the premium, if any,
on the security.

     "Redemption Date" when used with respect to any Security to be redeemed,
means the date fixed for such redemption pursuant to this Indenture.

     "Registration Rights Agreement" means the Registration Rights Agreement,
dated as of September 30, 2005, among the Company, the Guarantors and the
Initial Purchaser.

     "Rule 144" means Rule 144 under the Securities Act or any successor to such
Rule.

     "Rule 144A" means Rule 144A under the Securities Act or any successor to
such Rule.

     "SEC" means the United States Securities and Exchange Commission.

     "Securities" means the 7% Senior Convertible Notes due 2020 or any of them
(each, a "Security"), as amended or supplemented from time to time, that are
issued under this Indenture.

                                       -4-

<PAGE>

     "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations promulgated thereunder, as in effect from time to time.

     "Securities Custodian" means the Trustee, as custodian with respect to the
Securities in global form, or any successor thereto.

     "Significant Subsidiary" means, in respect of any Person, a Subsidiary of
such Person that would constitute a "significant subsidiary" as such term is
defined under Rule 1-02 of Regulation S-X under the Securities Act and the
Exchange Act.

     "Stated Maturity" means, with respect to any installment of interest or
principal on the Securities, the date on which such payment of interest or
principal is scheduled to be paid pursuant to this Indenture, and shall not
include any contingent obligations to repay, redeem or repurchase any such
interest or principal prior to the date originally scheduled for the payment
thereof.

     "Subsidiary" means, in respect of any Person, any corporation, association,
partnership or other business entity of which more than 50% of the total Voting
Power thereof is at the time owned or controlled, directly or indirectly, by (i)
such Person; (ii) such Person and one or more Subsidiaries of such Person; or
(iii) one or more Subsidiaries of such Person.

     "Termination of Trading" means the occurrence of the following event: the
Company's Common Stock (or other common stock into which the Securities are then
convertible) is neither listed for trading on a United States national
securities exchange nor approved for trading on an established automated
over-the-counter trading market in the United States.

     "TIA" means the Trust Indenture Act of 1939, as amended, and the rules and
regulations thereunder as in effect on the date of this Indenture, except as
provided in Section 12.3, and except to the extent any amendment to the Trust
Indenture Act expressly provides for application of the Trust Indenture Act as
in effect on another date.

     "Trading Day" means, with respect to any security, each day, other than
Saturday, Sunday or any other day on which securities are not generally traded
on the principal exchange or market in which such security is traded.

     "Transfer Restricted Security" means a Security required to bear the
restricted legend set forth in the form of Security set forth in Exhibit A of
this Indenture.

     "Trust Officer" means, with respect to the Trustee, any officer assigned to
the Corporate Trust Office, and also, with respect to a particular matter, any
other officer to whom such matter is referred because of such officer's
knowledge of and familiarity with the particular subject.

     "Trustee" means the party named as such in the first paragraph of this
Indenture until a successor replaces it in accordance with the provisions of
this Indenture, and thereafter means the successor.

     "Vice President" when used with respect to the Company or the Trustee,
means any vice president, whether or not designated by a number or a word or
words added before or after the title "vice president."

     "Voting Stock" of a Person means all classes of Capital Stock or other
interests (including partnership interests) of such Person then outstanding and
normally entitled (without regard to the occurrence of any contingency) to vote
in the election of directors, managers or trustees thereof.

                                       -5-

<PAGE>

SECTION 1.2. OTHER DEFINITIONS.

<TABLE>
<CAPTION>
                  TERM                     DEFINED IN SECTION
                  ----                     ------------------
<S>                                        <C>
"Agent Members" ........................          2.1(b)
"Bankruptcy Law" .......................          7.1
"Company Order" ........................          2.2
"Conversion Agent" .....................          2.3
"Current Market Price" .................          4.6(h)
"Custodian" ............................          7.1
"Depositary" ...........................          2.1(a)
"Distributed Assets or Securities" .....          4.6(d)
"DTC" ..................................          2.1(a)
"Event of Default" .....................          7.1
"Conversion Notice" ....................          4.2(a)
"Expiration Time" ......................          4.6(f)
"Fair Market Value" ....................          4.6(h)
"Fundamental Change Company Notice" ....          3.8(b)
"Fundamental Change Purchase Date" .....          3.8(a)
"Fundamental Change Purchase Notice" ...          3.8(b)
"Fundamental Change Purchase Price" ....          3.8(a)
"indenture securities" .................          1.3
"indenture securityholder" .............          1.3
"indenture to be qualified" ............          1.3
"indenture trustee" ....................          1.3
"institutional trustee" ................          1.3
"Legal Holiday" ........................         12.7
"Legend" ...............................         2.12(a)
"Make-Whole Premium" ...................         4.15
"Market Price" .........................         3.12(d)
"Maximum Conversion Rate" ..............          4.6(g)
"Notice of Default" ....................          7.1
"obligor" ..............................          1.3
"Offering Memorandum" ..................         10.1(k)
"Optional Redemption" ..................          3.1(a)
"Paying Agent" .........................          2.3
"Primary Registrar" ....................          2.3
"Purchase Agreement" ...................          2.1
"Purchased Shares" .....................          4.6(f)
"Put Right Purchase Date" ..............          3.7(a)
"Put Right Purchase Notice" ............          3.7(b)
"Put Right Purchase Offer" .............          3.7(b)
"Put Right Purchase Price" .............          3.7(a)
"QIB" ..................................          2.1(a)
"Record Date" ..........................          4.6(h)
"Redemption Price" .....................          3.1(a)
"Registrar" ............................          2.3
"Regular Record Date" ..................          3.1(a)
"successor corporation" ................          6.1(a)
"Trigger Event" ........................          4.6(d)
</TABLE>

                                       -6-

<PAGE>

SECTION 1.3. TRUST INDENTURE ACT PROVISIONS.

     Whenever this Indenture refers to a provision of the TIA, that provision is
incorporated by reference in and made a part of this Indenture. The Indenture
shall also include those provisions of the TIA required to be included herein by
the provisions of the Trust Indenture Reform Act of 1990. The following TIA
terms used in this Indenture have the following meanings:

     "indenture securities" means the Securities;

     "indenture security holder" means a Holder;

     "indenture to be qualified" means this Indenture;

     "indenture trustee" or "institutional trustee" means the Trustee; and
"obligor" on the indenture securities means the Company or any other obligor on
the Securities.

     All other terms used in this Indenture that are defined in the TIA, defined
by TIA reference to another statute or defined by any SEC rule and not otherwise
defined herein have the meanings assigned to them therein.

SECTION 1.4. RULES OF CONSTRUCTION.

     Unless the context otherwise requires:

          (a) a term has the meaning assigned to it;

          (b) an accounting term not otherwise defined has the meaning assigned
     to it in accordance with GAAP;

          (c) words in the singular include the plural, and words in the plural
     include the singular;

          (d) provisions apply to successive events and transactions;

          (e) the term "merger" includes a statutory share exchange and the term
     "merged" has a correlative meaning;

          (f) the masculine gender includes the feminine and the neuter;

          (g) references to agreements and other instruments include subsequent
     amendments thereto; and

          (h) "herein," "hereof" and other words of similar import refer to this
     Indenture as a whole and not to any particular Article, Section or other
     subdivision.

                                       -7-

<PAGE>

                                    ARTICLE 2

                                 THE SECURITIES

SECTION 2.1. FORM AND DATING.

     The Securities and the Trustee's certificate of authentication shall be
substantially in the respective forms set forth in Exhibit A, which Exhibit is
incorporated in and made part of this Indenture. The Securities may have
notations, legends or endorsements required by law, stock exchange rule or
usage. The Company shall provide any such notations, legends or endorsements to
the Trustee in writing. Each Security shall be dated the date of its
authentication. The Securities are being offered and sold by the Company
pursuant to a Purchase Agreement, dated September 27, 2005 (the "Purchase
Agreement"), among the Company, the Guarantors and the Initial Purchaser, in
transactions exempt from, or not subject to, the registration requirements of
the Securities Act.

     (a) Restricted Global Securities. All of the Securities are initially being
offered and sold to qualified institutional buyers as defined in Rule 144A
(collectively, "QIBs" or individually, each a "QIB") in reliance on Rule 144A
and shall be issued initially in the form of one or more Restricted Global
Securities, which shall be deposited on behalf of the purchasers of the
Securities represented thereby with the Trustee, at its Corporate Trust Office,
as custodian for the depositary, The Depository Trust Company ("DTC") (such
depositary, or any successor thereto, being hereinafter referred to as the
"Depositary"), and registered in the name of its nominee, Cede & Co., duly
executed by the Company and authenticated by the Trustee as hereinafter
provided. The aggregate principal amount of the Restricted Global Securities may
from time to time be increased or decreased by adjustments made on the records
of the Securities Custodian as hereinafter provided, subject in each case to
compliance with the Applicable Procedures.

     (b) Global Securities in General. Each Global Security shall represent such
of the outstanding Securities as shall be specified therein and each shall
provide that it shall represent the aggregate amount of outstanding Securities
from time to time endorsed thereon and that the aggregate amount of outstanding
Securities represented thereby may from time to time be reduced or increased, as
appropriate, to reflect exchanges, redemptions or purchases of such Securities.
Any adjustment of the aggregate principal amount of a Global Security to reflect
the amount of any increase or decrease in the amount of outstanding Securities
represented thereby shall be made by the Trustee in accordance with instructions
given by the Holder thereof as required by Section 2.12 and shall be made on the
records of the Trustee and the Depositary.

     Members of, or participants in, the Depositary ("Agent Members") shall have
no rights under this Indenture with respect to any Global Security held on their
behalf by the Depositary or under the Global Security, and the Depositary
(including, for this purpose, its nominee) may be treated by the Company, the
Trustee and any agent of the Company or the Trustee as the absolute owner and
Holder of such Global Security for all purposes whatsoever. Notwithstanding the
foregoing, nothing herein shall (A) prevent the Company, the Trustee or any
agent of the Company or the Trustee from giving effect to any written
certification, proxy or other authorization furnished by the Depositary or (B)
impair, as between the Depositary and its Agent Members, the operation of
customary practices governing the exercise of the rights of a Holder of any
Security.

     (c) Book-Entry Provisions. The Company shall execute and the Trustee shall,
in accordance with this Section 2.1(c), authenticate and deliver initially one
or more Global Securities that (i) shall be registered in the name of the
Depositary, (ii) shall be delivered by the Trustee to the Depositary or pursuant
to the Depositary's instructions and (iii) shall bear legends substantially to
the following effect:

                                       -8-

<PAGE>

          "UNLESS (1) THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED
     REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY TO THE COMPANY OR ITS AGENT
     FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND (2) ANY CERTIFICATE
     ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS
     REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY
     (AND ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS
     REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY),
     ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
     ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS
     AN INTEREST HEREIN. THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING
     OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A
     DEPOSITARY OR A NOMINEE THEREOF. THIS SECURITY IS EXCHANGEABLE FOR
     SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR
     ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE
     AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN
     DEFINITIVE FORM, THIS SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY
     THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE
     DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE
     DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF
     SUCH SUCCESSOR DEPOSITARY."

SECTION 2.2. EXECUTION AND AUTHENTICATION.

     An Officer shall sign the Securities for the Company by manual or facsimile
signature. Typographic and other minor errors or defects in any such facsimile
signature shall not affect the validity or enforceability of any Security which
has been authenticated and delivered by the Trustee.

     If an Officer whose signature is on a Security no longer holds that office
at the time the Trustee authenticates the Security, the Security shall be valid
nevertheless.

     A Security shall not be valid until an authorized signatory of the Trustee
manually signs the certificate of authentication on the Security. The signature
shall be conclusive evidence that the Security has been authenticated under this
Indenture.

     The Trustee shall (i) initially authenticate and make available for
delivery Securities for original issue in the aggregate principal amount of
$143,750,000 and (ii) the Trustee shall authenticate additional Notes in an
unlimited amount (so long as not otherwise prohibited by the terms of this
Indenture), in each case upon receipt of a written order or orders of the
Company signed by an Officer of the Company (a "Company Order"). The Company
Order shall specify the amount of Securities to be authenticated and shall
specify the date on which each original issue of Securities is to be
authenticated.

     All Notes issued under this Indenture shall be treated as a single class
for all purposes under this Indenture.

     The Trustee shall act as the initial authenticating agent. Thereafter, the
Trustee may appoint an authenticating agent acceptable to the Company to
authenticate Securities. An authenticating agent may authenticate Securities
whenever the Trustee may do so. Each reference in this Indenture to

                                       -9-

<PAGE>

authentication by the Trustee includes authentication by such agent. An
authenticating agent shall have the same rights as an Agent to deal with the
Company or an Affiliate of the Company.

     The Securities shall be issuable only in fully registered, book-entry form,
without coupons, and only in denominations of $1,000 principal amount and any
integral multiple thereof.

SECTION 2.3. REGISTRAR, PAYING AGENT AND CONVERSION AGENT.

     The Company shall maintain one or more offices or agencies where Securities
may be presented for registration of transfer or for exchange (each, a
"Registrar"), one or more offices or agencies where Securities may be presented
for payment (each, a "Paying Agent"), one or more offices or agencies where
Securities may be presented for conversion (each, a "Conversion Agent") and one
or more offices or agencies where notices and demands to or upon the Company in
respect of the Securities and this Indenture may be served. The Company will at
all times maintain a Paying Agent, Conversion Agent, Registrar and an office or
agency where notices and demands to or upon the Company in respect of the
Securities and this Indenture may be served in the Borough of Manhattan, The
City of New York. One of the Registrars (the "Primary Registrar") shall keep a
register of the Securities and of their transfer and exchange.

     The Company shall enter into an appropriate agency agreement with any Agent
not a party to this Indenture. The agreement shall implement the provisions of
this Indenture that relate to such Agent. The Company shall notify the Trustee
of the name and address of any Agent not a party to this Indenture. If the
Company fails to maintain a Registrar, Paying Agent, Conversion Agent or agent
for service of notices and demands in any place required by this Indenture, or
fails to give the foregoing notice, the Trustee shall act as such. The Company
or any Affiliate of the Company may act as Paying Agent (except for the purposes
of Article 9).

     The Company hereby initially designates the Trustee as Paying Agent,
Registrar, Securities Custodian and Conversion Agent, and each of the Corporate
Trust Office of the Trustee and the office or agency of the Trustee (which shall
initially be U.S. Bank National Association) shall be one such office or agency
of the Company for each of the aforesaid purposes.

SECTION 2.4. PAYING AGENT TO HOLD MONEY IN TRUST.

     Prior to 10:00 a.m., New York City time, on each due date of the principal
of or interest, if any, on any Securities, the Company shall deposit with a
Paying Agent a sum sufficient to pay such principal or interest, if any, so
becoming due. The Paying Agent shall hold in trust for the benefit of Holders or
the Trustee all money held by the Paying Agent for the payment of principal of
or interest, if any, on the Securities, and shall notify the Trustee of any
default by the Company (or any other obligor on the Securities) in making any
such payment. If the Company or an Affiliate of the Company acts as Paying
Agent, it shall, before 10:00 a.m., New York City time, on each due date of the
principal of or interest on any Securities, segregate the money and hold it as a
separate trust fund. The Company at any time may require a Paying Agent to pay
all money held by it to the Trustee, and the Trustee may at any time during the
continuance of any default, upon written request to a Paying Agent, require such
Paying Agent to pay forthwith to the Trustee all sums so held in trust by such
Paying Agent. Upon doing so, the Paying Agent (other than the Company) shall
have no further liability for the money.

SECTION 2.5. HOLDER LISTS.

     The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
Holders. If the Trustee is not the Primary Registrar, the

                                      -10-

<PAGE>

Company shall furnish to the Trustee on or before each semiannual interest
payment date, and at such other times as the Trustee may request in writing, a
list in such form and as of such date as the Trustee may reasonably require of
the names and addresses of Holders.

SECTION 2.6. TRANSFER AND EXCHANGE.

     Subject to compliance with any applicable additional requirements contained
in Section 2.12, when a Security is presented to a Registrar with a request to
register a transfer thereof or to exchange such Security for an equal principal
amount of Securities of other authorized denominations, the Registrar shall
register the transfer or make the exchange as requested; provided, however, that
every Security presented or surrendered for registration of transfer or exchange
shall be duly endorsed or accompanied by an assignment form and, if applicable,
an assignment agreement each in the form included in Exhibit B, and in form
satisfactory to the Registrar duly executed by the Holder thereof or its
attorney duly authorized in writing. To permit registration of transfers and
exchanges, upon surrender of any Security for registration of transfer or
exchange at an office or agency maintained pursuant to Section 2.3, the Company
shall execute and the Trustee shall authenticate Securities of a like aggregate
principal amount at the Registrar's request. Any exchange or transfer shall be
without charge, except that the Company or the Registrar may require payment of
a sum sufficient to cover any tax or other governmental charge that may be
imposed in relation thereto.

     Neither the Company, any Registrar nor the Trustee shall be required to
exchange or register a transfer of (i) any Securities for a period of 15 days
next preceding any mailing of a notice of Securities to be redeemed, (ii) any
Securities or portions thereof selected or called for redemption (except, in the
case of redemption of a Security in part, the portion thereof not to be
redeemed) or (iii) any Securities or portions thereof in respect of which a
Fundamental Change Company Notice has been delivered and not withdrawn by the
Holder thereof (except, in the case of the purchase of a Security in part, the
portion thereof not to be purchased). All Securities issued upon any transfer or
exchange of Securities shall be valid obligations of the Company, evidencing the
same debt and entitled to the same benefits under this Indenture, as the
Securities surrendered upon such transfer or exchange.

     Any Registrar appointed pursuant to Section 2.3 shall provide to the
Trustee such information as the Trustee may reasonably require in connection
with the delivery by such Registrar of Securities upon transfer or exchange of
Securities.

     Each Holder of a Security agrees to indemnify the Company and the Trustee
against any liability that may result from the transfer, exchange or assignment
of such Holder's Security in violation of any provision of this Indenture and/or
applicable United States federal or state securities law.

     The Trustee shall have no obligation or duty to monitor, determine or
inquire as to compliance with any restrictions on transfer imposed under this
Indenture or under applicable law with respect to any transfer of any interest
in any Security (including any transfers between or among Agent Members or other
beneficial owners of interests in any Global Security) other than to require
delivery of such certificates and other documentation or evidence as are
expressly required by, and to do so if and when expressly required by the terms
of, this Indenture, and to examine the same to determine substantial compliance
as to form with the express requirements hereof.

SECTION 2.7. REPLACEMENT SECURITIES.

     If any mutilated Security is surrendered to the Company, a Registrar or the
Trustee, or the Company, a Registrar and the Trustee receive evidence to their
satisfaction of the destruction, loss or theft of any Security, and there is
delivered to the Company, the applicable Registrar and the Trustee such

                                      -11-

<PAGE>

security or indemnity as may be required by them to save each of them harmless,
then, in the absence of notice to the Company, such Registrar or the Trustee
that such Security has been acquired by a bona fide purchaser, the Company shall
execute, and upon its written request the Trustee shall authenticate and
deliver, in exchange for any such mutilated Security or in lieu of any such
destroyed, lost or stolen Security, a new Security of like tenor and principal
amount, bearing a number not contemporaneously outstanding.

     In case any such mutilated, destroyed, lost or stolen Security has become
or is about to become due and payable, or is about to be redeemed or purchased
by the Company pursuant to Article 3, the Company in its discretion may, instead
of issuing a new Security, pay, redeem or purchase such Security, as the case
may be.

     Upon the issuance of any new Securities under this Section 2.7, the Company
may require the payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in relation thereto and any other
reasonable expenses (including the reasonable fees and expenses of the Trustee
or the Registrar) in connection therewith.

     Every new Security issued pursuant to this Section 2.7 in lieu of any
mutilated, destroyed, lost or stolen Security shall constitute an original
additional contractual obligation of the Company, whether or not the mutilated,
destroyed, lost or stolen Security shall be at any time enforceable by anyone,
and shall be entitled to all benefits of this Indenture equally and
proportionately with any and all other Securities duly issued hereunder.

     The provisions of this Section 2.7 are (to the extent lawful) exclusive and
shall preclude (to the extent lawful) all other rights and remedies with respect
to the replacement or payment of mutilated, destroyed, lost or stolen
Securities.

SECTION 2.8. OUTSTANDING SECURITIES.

     Securities outstanding at any time are all Securities authenticated by the
Trustee, except for those canceled by it, those converted pursuant to Article 4,
those delivered to it for cancellation or surrendered for transfer or exchange
and those described in this Section 2.8 as not outstanding.

     If a Security is replaced pursuant to Section 2.7, it ceases to be
outstanding unless the Company receives proof satisfactory to it that the
replaced Security is held by a bona fide purchaser.

     If a Paying Agent (other than the Company or an Affiliate of the Company)
holds on a Redemption Date, a Put Right Purchase Date, a Fundamental Change
Purchase Date or the Final Maturity Date money sufficient to pay the principal
of (including premium, if any) and accrued interest on Securities (or portions
thereof) payable on that date, then on and after such Redemption Date, Put Right
Purchase Date, Fundamental Change Purchase Date or the Final Maturity Date, as
the case may be, such Securities (or portions thereof, as the case may be) shall
cease to be outstanding and interest on them shall cease to accrue; provided,
that if such Securities are to be redeemed, notice of such redemption has been
duly given pursuant to this Indenture or provision therefore satisfactory to the
Trustee has been made.

     A Security does not cease to be outstanding because the Company or an
Affiliate of the Company holds the Security.

                                      -12-

<PAGE>

SECTION 2.9. TREASURY SECURITIES.

     In determining whether the Holders of the required principal amount of
Securities have concurred in any notice, direction, waiver or consent,
Securities owned by the Company or any other obligor on the Securities or by any
Affiliate of the Company or of such other obligor shall be disregarded, except
that, for purposes of determining whether the Trustee shall be protected in
relying on any such notice, direction, waiver or consent, only Securities which
a Trust Officer of the Trustee actually knows are so owned shall be so
disregarded. Securities so owned which have been pledged in good faith shall not
be disregarded if the pledgee establishes to the satisfaction of the Trustee the
pledgee's right so to act with respect to the Securities and that the pledgee is
not the Company or any other obligor on the Securities or any Affiliate of the
Company or of such other obligor.

SECTION 2.10. TEMPORARY SECURITIES.

     Until definitive Securities are ready for delivery, the Company may prepare
and execute, and, upon receipt of a Company Order, the Trustee shall
authenticate and deliver, temporary Securities. Temporary Securities shall be
substantially in the form of definitive Securities but may have variations that
the Company with the consent of the Trustee considers appropriate for temporary
Securities. Without unreasonable delay, the Company shall prepare and the
Trustee shall authenticate and deliver definitive Securities in exchange for
temporary Securities.

SECTION 2.11. CANCELLATION.

     The Company at any time may deliver Securities to the Trustee for
cancellation. The Registrar, the Paying Agent and the Conversion Agent shall
forward to the Trustee or its agent any Securities surrendered to them for
transfer, exchange, conversion, redemption or payment. The Trustee and no one
else shall cancel, in accordance with its standard procedures, all Securities
surrendered for transfer, exchange, conversion, redemption or payment or
cancellation and shall deliver the canceled Securities to the Company. All
Securities which are redeemed, purchased or otherwise acquired by the Company or
any of its Subsidiaries prior to the Final Maturity Date shall be delivered to
the Trustee for cancellation, and the Company may not hold or resell such
securities or issue any new Securities to replace any such Securities or any
Securities that any Holder has converted pursuant to Article 4.

SECTION 2.12. LEGEND; ADDITIONAL TRANSFER AND EXCHANGE REQUIREMENTS.

     (a) If Securities are issued upon the transfer, exchange or replacement of
Securities subject to restrictions on transfer and bearing the legends set forth
on the forms of Securities attached hereto as Exhibit A (collectively, the
"Legend"), or if a request is made to remove the Legend on a Security, the
Securities so issued shall bear the Legend, or the Legend shall not be removed,
as the case may be, unless there is delivered to the Company and the Registrar
such satisfactory evidence, which shall include an opinion of counsel if
requested by the Company or such Registrar, as may be reasonably required by the
Company and the Registrar, that neither the Legend nor the restrictions on
transfer set forth therein are required to ensure that transfers thereof comply
with the provisions of Rule 144A or Rule 144 under the Securities Act or that
such Securities are not "restricted" within the meaning of Rule 144 under the
Securities Act; provided, that no such evidence need be supplied in connection
with the sale of such Security pursuant to a registration statement that is
effective at the time of such sale. Upon (i) provision of such satisfactory
evidence if requested, or (ii) notification by the Company to the Trustee and
Registrar of the sale of such Security pursuant to a registration statement that
is effective at the time of such sale, the Trustee, at the written direction of
the Company, shall authenticate and deliver a Security that does not bear the
Legend. If the Legend is removed from the face of a Security and the Security is
subsequently held by an Affiliate of the Company, the Legend shall be
reinstated.

                                      -13-

<PAGE>

     (b) A Global Security may not be transferred, in whole or in part, to any
Person other than the Depositary or a nominee or any successor thereof, and no
such transfer to any such other Person may be registered; provided, that the
foregoing shall not prohibit any transfer of a Security that is issued in
exchange for a Global Security but is not itself a Global Security. No transfer
of a Security to any Person shall be effective under this Indenture or the
Securities unless and until such Security has been registered in the name of
such Person. Notwithstanding any other provisions of this Indenture or the
Securities, transfers of a Global Security, in whole or in part, shall be made
only in accordance with this Section 2.12.

     (c) Subject to the succeeding paragraph, every Security shall be subject to
the restrictions on transfer provided in the Legend other than a Restricted
Global Security. Whenever any Transfer Restricted Security other than a
Restricted Global Security is presented or surrendered for registration of
transfer or for exchange for a Security registered in a name other than that of
the Holder, such Security must be accompanied by a certificate in substantially
the form set forth in Exhibit C, dated the date of such surrender and signed by
the Holder of such Security, as to compliance with such restrictions on
transfer. The Registrar shall not be required to accept for such registration of
transfer or exchange any Security not so accompanied by a properly completed
certificate.

     (d) The restrictions imposed by the Legend upon the transferability of any
Security shall cease and terminate when such Security has been sold pursuant to
an effective registration statement under the Securities Act or transferred in
compliance with Rule 144 (or any successor provision thereto) or, if earlier,
upon the expiration of the holding period applicable to sales thereof under Rule
144(k) under the Securities Act (or any successor provision). Any Security as to
which such restrictions on transfer shall have expired in accordance with their
terms or shall have terminated may, upon a surrender of such Security for
exchange to the Registrar in accordance with the provisions of this Section 2.12
(accompanied, in the event that such restrictions on transfer have terminated by
reason of a transfer in compliance with Rule 144 or any successor provision, by,
if requested, an opinion of counsel reasonably acceptable to the Company,
addressed to the Company and in form acceptable to the Company, to the effect
that the transfer of such Security has been made in compliance with Rule 144 or
such successor provision), be exchanged for a new Security, of like tenor and
aggregate principal amount, which shall not bear the restrictive Legend. The
Company shall inform the Trustee of the effective date of any registration
statement registering the Securities under the Securities Act. The Trustee shall
not be liable for any action taken or omitted to be taken by it in good faith in
accordance with the aforementioned opinion of counsel or registration statement.

     (e) As used in the preceding two paragraphs of this Section 2.12, the term
"transfer" encompasses any sale, pledge, transfer, hypothecation or other
disposition of any Security.

     (f) The provisions of clauses (1), (2), (3) and (4) below shall apply only
to Global Securities:

          (1) Notwithstanding any other provisions of this Indenture or the
     Securities, a Global Security shall not be exchanged in whole or in part
     for a Security registered in the name of any Person other than the
     Depositary or one or more nominees thereof, provided, that a Global
     Security may be exchanged for Securities registered in the names of any
     person designated by the Depositary in the event that (A) the Depositary
     has notified the Company that it is unwilling or unable to continue as
     Depositary for such Global Security or such Depositary has ceased to be a
     "clearing agency" registered under the Exchange Act, and a successor
     Depositary is not appointed by the Company within 90 days, or (B) an Event
     of Default has occurred and is continuing with respect to the Securities.
     Any Global Security exchanged pursuant to clause (A) above shall be so
     exchanged in whole and not in part, and any Global Security exchanged
     pursuant to clause (B) above may be exchanged in whole or from time to time
     in part as directed by the Depositary.

                                      -14-

<PAGE>

     Any Security issued in exchange for a Global Security or any portion
     thereof shall be a Global Security; provided, that any such Security so
     issued that is registered in the name of a Person other than the Depositary
     or a nominee thereof shall not be a Global Security.

          (2) Securities issued in exchange for a Global Security or any portion
     thereof shall be issued in definitive, fully-registered book entry form,
     without interest coupons, shall have an aggregate principal amount equal to
     that of such Global Security or portion thereof to be so exchanged, shall
     be registered in such names and be in such authorized denominations as the
     Depositary shall designate and shall bear the applicable legends provided
     for herein. Any Global Security to be exchanged in whole shall be
     surrendered by the Depositary to the Trustee, as Registrar. With regard to
     any Global Security to be exchanged in part, either such Global Security
     shall be so surrendered for exchange or, if the Trustee is acting as
     custodian for the Depositary or its nominee with respect to such Global
     Security, the principal amount thereof shall be reduced, by an amount equal
     to the portion thereof to be so exchanged, by means of an appropriate
     adjustment made on the records of the Trustee. Upon any such surrender or
     adjustment, the Trustee shall authenticate and deliver the Security
     issuable on such exchange to or upon the order of the Depositary or an
     authorized representative thereof.

          (3) The registered Holder may grant proxies and otherwise authorize
     any Person, including Agent Members and persons that may hold interests
     through Agent Members, to take any action which a Holder is entitled to
     take under this Indenture or the Securities.

          (4) In the event of the occurrence of any of the events specified in
     clause (1) above, the Company will promptly make available to the Trustee a
     reasonable supply of Certificated Securities in definitive, fully
     registered form, without interest coupons.

     Neither Agent Members nor any other Persons on whose behalf Agent Members
may act shall have any rights under this Indenture with respect to any Global
Security registered in the name of the Depositary or any nominee thereof, or
under any such Global Security, and the Depositary or such nominee, as the case
may be, may be treated by the Company, the Trustee and any agent of the Company
or the Trustee as the absolute owner and holder of such Global Security for all
purposes whatsoever. Notwithstanding the foregoing, nothing herein shall prevent
the Company, the Trustee or any agent of the Company or the Trustee from giving
effect to any written certification, proxy or other authorization furnished by
the Depositary or such nominee, as the case may be, or impair, as between the
Depositary, its Agent Members and any other person on whose behalf an Agent
Member may act, the operation of customary practices of such Persons governing
the exercise of the rights of a holder of any Security.

SECTION 2.13. CUSIP NUMBERS.

     The Company in issuing the Securities may use one or more "CUSIP" numbers
(if then generally in use), and, if so, the Trustee shall use "CUSIP" numbers in
notices of redemption or purchase as a convenience to Holders; provided, that
any such notice may state that no representation is made as to the correctness
of such numbers either as printed on the Securities or as contained in any
notice of a redemption or purchase and that reliance may be placed only on the
other identification numbers printed on the Securities, and any such redemption
or purchase shall not be affected by any defect in or omission of such numbers.
The Company will promptly notify the Trustee of any change in the "CUSIP"
numbers.

                                      -15-

<PAGE>

SECTION 2.14. SENIOR UNSECURED OBLIGATIONS.

     The Securities are senior unsecured obligations of the Company and rank
equally in right of payment with all existing and future unsecured and
unsubordinated indebtedness of the Company and senior to existing and future
subordinated indebtedness of the Company.

SECTION 2.15. CALCULATIONS REGARDING THE SECURITIES.

     Except as explicitly specified otherwise in this Indenture, the Company and
its agents shall be responsible for making all calculations as contemplated
under this Indenture and the Securities. These calculations include, but are not
limited to, determinations of the Conversion Price and Conversion Rate
applicable to the Securities. The Company and its agents shall make such
calculations in good faith and, absent manifest error, such calculations shall
be final and binding upon all Holders of the Securities. The Company shall
provide a schedule of these calculations to the Trustee, and the Trustee is
entitled to rely on the accuracy of such calculations without conducting an
independent verification as to the accuracy thereof. The Trustee will forward
the Company's calculations to any Holder upon request.

                                    ARTICLE 3

                           REDEMPTION AND REPURCHASES

SECTION 3.1. COMPANY'S RIGHTS TO REDEEM; NOTICE TO TRUSTEE.

     (a) Prior to October 5, 2010, the Securities shall not be redeemable at the
Company's option. The Securities may be redeemed at the election of the Company
(the "Optional Redemption"), as a whole or from time to time in part, at any
time on or after October 5, 2010, at a redemption price equal to 100% of the
principal amount of those Securities plus accrued and unpaid interest (including
Liquidated Damages, if any) to, but not including, such Redemption Date (the
"Redemption Price"), if the Closing Price of the Common Stock has exceeded 115%
of the Conversion Price for at least 20 Trading Days in the 30 consecutive
Trading Day period ending on the Trading Day before the date on which the
Company mails the notice of redemption (and the Trustee shall be entitled to
assume that such condition has been satisfied based upon its receipt of the
notice set forth in Section 3.1(b)); provided that if the Redemption Date falls
after an interest payment record date (the "Regular Record Date") and on or
before an interest payment date, then the interest (including Liquidated
Damages, if any) will be payable to the Holders in whose name the Securities are
registered at the close of business on the Regular Record Date and the
Redemption Price shall not include such interest payment.

     (b) If the Company elects to redeem Securities pursuant to Section 3.1(a),
it shall give the notice specified in Section 3.3(a). If fewer than all of the
Securities are to be redeemed, the record date relating to such redemption shall
be selected by the Company and given to the Trustee, which record date shall not
be less than ten days after the date of notice to the Trustee.

SECTION 3.2. SELECTION OF SECURITIES TO BE REDEEMED.

     (a) If less than all of the Securities are to be redeemed, unless the
Applicable Procedures provide otherwise, the Trustee shall, at least 30 days but
not more than 60 days prior to the Redemption Date, select the Securities to be
redeemed. The Trustee shall make the selection from the Securities outstanding
and not previously called for redemption, by lot, or in its discretion, on a pro
rata basis. Securities in denominations of $1,000 may only be redeemed in whole.
The Trustee may select for redemption portions (equal to $1,000 or any integral
multiple thereof) of the principal of Securities that

                                      -16-

<PAGE>

have denominations larger than $1,000. Provisions of this Indenture that apply
to Securities called for redemption also apply to portions of Securities called
for partial redemption.

     (b) If any Security selected for partial redemption is converted in part
before termination of the conversion right with respect to the portion of the
Security so selected, the converted portion of such Security shall be deemed to
be taken from the portion selected for redemption. Securities which have been
converted during a selection of Securities to be redeemed shall be treated by
the Trustee as outstanding for the purpose of such selection.

SECTION 3.3. NOTICE OF REDEMPTION.

     (a) At least 30 days but not more than 60 days before a Redemption Date,
the Company shall mail or cause to be mailed a notice of redemption to each
Holder of Securities to be redeemed at such Holder's address as it appears on
the register of Securities maintained by the Primary Registrar.

     (b) The notice shall identify the Securities (including CUSIP numbers) to
be redeemed and shall state:

          (1) the Redemption Date;

          (2) the Redemption Price;

          (3) the then current Conversion Price;

          (4) the name and address of each Paying Agent and Conversion Agent;

          (5) that Securities called for redemption must be presented and
     surrendered to a Conversion Agent to collect the Redemption Price;

          (6) that Holders who wish to convert Securities must surrender such
     Securities for conversion no later than the close of business on the
     Business Day immediately preceding the Redemption Date and must satisfy the
     other requirements set forth in Section 12 of the Securities;

          (7) that, unless the Company defaults in making the payment of the
     Redemption Price, interest on Securities called for redemption shall cease
     accruing on and after the Redemption Date and the only remaining right of
     the Holder shall be to receive payment of the Redemption Price upon
     presentation and surrender to a Paying Agent of the Securities; and

          (8) if any Security is being redeemed in part, the portion of the
     principal amount of such Security to be redeemed and that, after the
     Redemption Date, upon presentation and surrender of such Security, a new
     Security or Securities in aggregate principal amount equal to the
     unredeemed portion thereof will be issued.

If any of the Securities to be redeemed is in the form of a Global Security,
then the Company shall modify such notice to the extent necessary to accord with
the Applicable Procedures. At the Company's written request, which request shall
(i) be irrevocable once given and (ii) set forth all relevant information
required by clauses (1) through (8) of the preceding paragraph, the Trustee
shall give the notice of redemption in the Company's name and at the Company's
expense; provided that the text of such notice shall be prepared by the Company.

                                      -17-

<PAGE>

SECTION 3.4. EFFECT OF NOTICE OF REDEMPTION.

     Once notice of redemption is mailed, Securities called for redemption
become due and payable on the Redemption Date and at the Redemption Price stated
in the notice, except for Securities that are converted in accordance with the
provisions of Article 4. Upon presentation and surrender to a Paying Agent,
Securities called for redemption shall be paid at the Redemption Price;
provided, that if the Redemption Date falls after an interest payment record
date and on or before an interest payment date, then the interest (including
Liquidated Damages, if any) will be payable to the Holders in whose name the
Securities are registered at the Regular Record Date.

SECTION 3.5. DEPOSIT OF REDEMPTION PRICE.

     Prior to noon, New York City time, on the Redemption Date, the Company
shall deposit with the Paying Agent (or if the Company or a Subsidiary or an
Affiliate of any of them is acting as the Paying Agent, shall segregate and hold
in trust as provided in Section 2.4) an amount of cash (in immediately available
funds if deposited on such Redemption Date) sufficient to pay the Redemption
Price on all Securities to be redeemed on that date, other than Securities or
portions thereof called for redemption on that date which have been delivered by
the Company to the Trustee for cancellation or have been converted. The Paying
Agent shall as promptly as practicable return to the Company any money not
required for that purpose because of the conversion of Securities pursuant to
Article 4 or, if such money is then held by the Company in trust and is not
required for such purpose, it shall be discharged from the trust.

     If the Paying Agent holds, in accordance with the terms hereof, at noon,
New York City time, on the Redemption Date, cash sufficient to pay the
Redemption Price for all Securities to be redeemed on such date, then,
immediately after such Redemption Date, such Securities shall cease to be
outstanding and interest on such Securities will cease to accrue, whether or not
such Securities are delivered to the Paying Agent, and the rights of the Holders
in respect thereof shall terminate (other than the right to receive the
Redemption Price upon delivery of such Securities).

SECTION 3.6. SECURITIES REDEEMED IN PART.

     Upon presentation and surrender of a Security that is redeemed in part, the
Company shall execute and the Trustee shall authenticate and deliver to the
Holder a new Security equal in principal amount to the unredeemed portion of the
Security surrendered.

SECTION 3.7. REPURCHASE OF SECURITIES AT THE OPTION OF HOLDERS ON SPECIFIC
DATES.

     (a) Securities shall be purchased by the Company, in whole or in part, at
the option of the Holder thereof, on September 30, 2010 and September 30, 2015
(each, a "Put Right Purchase Date") for cash, shares of Common Stock or a
combination thereof, in the Company's sole discretion, at a purchase price equal
to 100% of the principal amount of those Securities plus accrued and unpaid
interest (including Liquidated Damages, if any) to, but not including, such Put
Right Purchase Date (the "Put Right Purchase Price"), subject to satisfaction by
or on behalf of the Holder of the requirements set forth in this Section 3.7.

     (b) No later than 20 days prior to each Put Right Purchase Date, the
Company shall mail a written notice of the repurchase right under Section 3.7(a)
(a "Put Right Purchase Offer") by first class mail to the Trustee and to each
Holder (and to beneficial owners as required by applicable law). The Company
shall disseminate a press release through Dow Jones & Company, Inc. or Bloomberg
Business News containing the information specified in such notice, or publish
the notice in a newspaper of general

                                      -18-

<PAGE>

circulation in New York City, or post the notice on the Company's website, or
disseminate the information through some other public means that the Company, in
its reasonable discretion, deems appropriate. The Put Right Purchase Offer shall
include a form of notice to be completed by the Holder and returned to the
Company in the event that the Holder elects to exercise its repurchase rights
under Section 3.7(a) (the "Put Right Purchase Notice"). The Put Right Purchase
Offer shall briefly state, as applicable:

          (1) the amount of Put Right Purchase Price;

          (2) that any Securities with respect to which the Holder has delivered
     a Put Right Purchase Notice may be converted in accordance with the terms
     of this Indenture only if such Holder withdraws such Put Right Purchase
     Notice in accordance with this Section 3.7; and

          (3) the procedures the Holder must follow in order to exercise its
     rights under this Section 3.7.

If any of the Securities subject to the Put Right Purchase Offer is in the form
of a Global Security, then the Company shall modify such Put Right Purchase
Offer to the extent necessary to accord with the Applicable Procedures. At the
Company's written request, which shall set forth all relevant information
required by clauses (1) through (3) of the preceding paragraph, the Trustee
shall give the Put Right Purchase Offer in the Company's name and at the
Company's expense; provided that the text of the Put Right Purchase Offer shall
be prepared by the Company.

     (c) A Holder may exercise its repurchase rights under Section 3.7(a) upon
delivery of a properly completed Put Right Purchase Notice to the Paying Agent
at any time during the period beginning at 9:00 a.m., New York City time, on the
date that is 20 days immediately preceding the relevant Put Right Purchase Date
until 5:00 p.m., New York City time, on the Business Day immediately preceding
such Put Right Purchase Date, stating:

          (1) the certificate number, if any, of the Security in respect of
     which such Put Right Purchase Notice is being submitted or, if the Security
     is not then issued as a Certificated Security, that the Put Right Purchase
     Notice complies with the Applicable Procedures of the Depositary in effect
     at that time;

          (2) the portion of the principal amount of the Security which the
     Holder will deliver to be repurchased, which portion must be in principal
     amounts of $1,000 or an integral multiple of $1,000; and

          (3) that such Security shall be repurchased by the Company as of the
     Put Right Purchase Date pursuant to the terms and conditions specified in
     the Securities and in this Indenture.

     (d) The delivery of a Security to the Paying Agent with, or at any time
after delivery of, the Purchase Notice (together with all necessary
endorsements) at the offices of the Paying Agent shall be a condition to the
receipt by the Holder of the Put Right Purchase Price therefor; provided,
however, that such Put Right Purchase Price shall be so paid pursuant to this
Section 3.7 only if the Security so delivered to the Paying Agent shall conform
in all respects to the description thereof set forth in the related Put Right
Purchase Notice.

     The Company shall repurchase from the Holder thereof, pursuant to this
Section 3.7, a portion of a Security, so long as the principal amount of such
portion is $1,000 or an integral multiple of $1,000.

                                      -19-

<PAGE>

Provisions of this Indenture that apply to the repurchase of all of a Security
also apply to the repurchase of such portion of such Security.

     Notwithstanding anything contained herein to the contrary, any Holder
delivering to the Paying Agent the Put Right Purchase Notice contemplated by
Section 3.7(b) shall have the right to withdraw such Put Right Purchase Notice
at any applicable time prior to 5:00 p.m., New York City time, on the second
Business Day immediately preceding the Put Right Purchase Date by delivery of a
written notice of withdrawal to the Paying Agent in accordance with Section
3.7(f).

     The Paying Agent shall promptly notify the Company of the receipt by it of
any Put Right Purchase Notice or written notice of withdrawal thereof.

     (e) Upon receipt by the Paying Agent of the Put Right Purchase Notice, the
Holder of the Security in respect of which such Put Right Purchase Notice was
given shall (unless such Put Right Purchase Notice is withdrawn as specified in
Section 3.7(f)) thereafter be entitled to receive solely the Put Right Purchase
Price with respect to such Security. Such Put Right Purchase Price shall be paid
to such Holder, subject to receipt of cash, shares of Common Stock or a
combination thereof, as the case may be, by the Paying Agent, promptly (but
within two Business Days) following the later of (a) the Put Right Purchase Date
with respect to such Security (provided the conditions in Section 3.7(c) have
been satisfied) and (b) the time of delivery of such Security to the Paying
Agent by the Holder thereof in the manner required by Section 3.7(c). Securities
in respect of which a Put Right Purchase Notice has been given by the Holder
thereof may not be converted pursuant to Article 4 on or after the date of the
delivery of such Put Right Purchase Notice unless such Put Right Purchase Notice
has first been validly withdrawn as specified in Section 3.7(f).

     (f) A Put Right Purchase Notice may be withdrawn by means of a written
notice of withdrawal delivered to the office of the Paying Agent in accordance
with the Put Right Purchase Notice at any time prior to 5:00 p.m., New York City
time, on the second Business Day immediately preceding the Put Right Purchase
Date, specifying:

          (1) the name of the Holder;

          (2) a statement that the Holder is withdrawing its election to require
     the Company to repurchase its Securities;

          (3) the certificate number, if any, of the Security in respect of
     which such notice of withdrawal is being submitted or, if the Security is
     not then issued as a Certificated Security, that the notice of withdrawal
     complies with the Applicable Procedures of the Depositary in effect at that
     time;

          (4) the principal amount of the Security with respect to which such
     notice of withdrawal is being submitted; and

          (5) the principal amount, if any, of such Security which remains
     subject to the original Put Right Purchase Notice and which has been or
     will be delivered for repurchase by the Company, which must be an integral
     multiple of $1,000.

     (g) Prior to noon, New York City time, on the Business Day following the
applicable Put Right Purchase Date, the Company shall deposit with the Paying
Agent (or if the Company or a Subsidiary or an Affiliate of any of them is
acting as the Paying Agent, shall segregate and hold in trust as provided in
Section 2.4) an amount of cash (in immediately available funds if deposited on
such Put Right

                                      -20-

<PAGE>

Purchase Date) or shares of Common Stock or a combination thereof, as the case
may be, sufficient to pay the aggregate Put Right Purchase Price of all the
Securities or portions thereof which are to be purchased on such Put Right
Purchase Date.

     If the Paying Agent holds, in accordance with the terms hereof, at noon,
New York City time, on the Business Day following the applicable Put Right
Purchase Date, cash or shares of Common Stock or a combination thereof, as the
case may be, sufficient to pay the Put Right Purchase Price of any Securities
for which a Put Right Purchase Notice has been tendered and not withdrawn
pursuant to Section 3.7(f), then, immediately after such Put Right Purchase
Date, such Securities will cease to be outstanding and interest on such
Securities will cease to accrue, whether or not such Securities are delivered to
the Paying Agent, and the rights of the Holders in respect thereof shall
terminate (other than the right to receive the Put Right Purchase Price upon
delivery of such Securities).

     (h) Any Certificated Security which is to be repurchased only in part shall
be surrendered at the office of the Paying Agent (with, if the Company or the
Trustee so requires, due endorsement by, or a written instrument of transfer in
form satisfactory to the Company and the Trustee duly executed by, the Holder
thereof or such Holder's attorney duly authorized in writing) and the Company
shall execute and the Trustee shall authenticate and deliver to the Holder of
such Security, without charge, a new Security or Securities, of any authorized
denomination as requested by such Holder in aggregate principal amount equal to,
and in exchange for, the portion of the principal amount of the Security so
surrendered which is not repurchased.

SECTION 3.8. REPURCHASE OF SECURITIES AT OPTION OF THE HOLDER UPON A FUNDAMENTAL
CHANGE.

     (a) If a Fundamental Change occurs at any time prior to the Final Maturity
Date, each Holder will have the right to require the Company to repurchase all
of its Securities not previously called for redemption, or any portion of such
Securities, for cash, shares of Common Stock or a combination thereof (at the
Company's election), at a purchase price equal to 100% of the principal amount
of all such Securities, plus accrued and unpaid interest (including Liquidated
Damages, if any) on such Securities to, but not including, the Fundamental
Change Purchase Date (the "Fundamental Change Purchase Price"), subject to
satisfaction by or on behalf of any Holder of the requirements set forth in this
Section 3.8. The date the Company shall repurchase the Securities pursuant to
this Section 3.8(a) (the "Fundamental Change Purchase Date") shall be no earlier
than 15 days and no later than 30 days after the date of the mailing of the
Fundamental Change Company Notice under Section 3.8(b).

     (b) No later than 20 days after the occurrence of a Fundamental Change, the
Company shall mail a written notice of such Fundamental Change (the "Fundamental
Change Company Notice") by first class mail to the Trustee and to each Holder
(and to beneficial owners as required by applicable law). The Company shall
disseminate a press release through Dow Jones & Company, Inc. or Bloomberg
Business News containing the information specified in such notice, or publish
the notice in a newspaper of general circulation in New York City, or post the
notice on the Company's website, or disseminate the information through some
other public means that the Company deems appropriate. The Fundamental Change
Company Notice shall include a form of notice to be completed by the Holder in
the event the Holder elects to exercise its repurchase right under Section
3.8(a) (the "Fundamental Change Purchase Notice"). The Fundamental Change
Company Notice shall briefly state, as applicable:

          (1) that a Fundamental Change has occurred;

          (2) the date of such Fundamental Change;

          (3) the Fundamental Change Purchase Date;

                                      -21-

<PAGE>

          (4) the date by which the Fundamental Change Purchase Notice must be
     delivered to the Paying Agent in order for a Holder to exercise the
     Fundamental Change repurchase right;

          (5) the amount of the Fundamental Change Purchase Price;

          (6) the name and address of the Paying Agent and the Conversion Agent;

          (7) the procedures for withdrawing a Fundamental Change Repurchase
     Notice;

          (8) the Conversion Rate applicable on the date of the Fundamental
     Change Company Notice and any adjustments to the Conversion Rate that will
     result from the Fundamental Change (including any Make-Whole Premium);

          (9) that the Securities with respect to which the Holder has delivered
     a Fundamental Change Purchase Notice may be converted in accordance with
     the terms of this Indenture, only if such Holder withdraws such Fundamental
     Change Purchase Notice in accordance with Section 3.8(f); and

          (10) the procedures the Holder must follow in order to exercise its
     rights under this Section 3.8.

     If any of the Securities subject to the Fundamental Change Company Notice
is in the form of a Global Security, then the Company shall modify such
Fundamental Change Company Notice to the extent necessary to accord with the
Applicable Procedures. At the Company's written request, which shall set forth
all relevant information required by clauses (1) through (10) of the preceding
paragraph, the Trustee shall give the Fundamental Change Company Notice in the
Company's name and at the Company's expense; provided that the text of the
Fundamental Change Company Notice shall be prepared by the Company.

     (c) A Holder may exercise its repurchase rights under Section 3.8(a) upon
delivery of a properly completed Fundamental Change Purchase Notice to the
Paying Agent at any time from the opening of business on the date of the
Fundamental Change Company Notice until 5:00 p.m., New York City time, on the
fifth Business Day immediately preceding the Fundamental Change Purchase Date,
stating:

          (1) the certificate number, if any, of the Security in respect of
     which such Fundamental Change Purchase Notice is being submitted or, if the
     Security is not then issued as a Certificated Security, that the
     Fundamental Change Purchase Notice complies with the Applicable Procedures
     of the Depositary in effect at that time;

          (2) the portion of the principal amount of the Security that the
     Holder will deliver to be repurchased, which portion must be $1,000 or an
     integral multiple of $1,000; and

          (3) that such Security shall be repurchased on the Fundamental Change
     Repurchase Date pursuant to the terms and conditions specified in the
     Securities and in this Indenture.

     (d) The delivery of a Security to the Paying Agent with, or at any time
after delivery of, the Fundamental Change Purchase Notice (together with all
necessary endorsements) at the offices of the Paying Agent shall be a condition
to the receipt by the Holder of the Fundamental Change Purchase Price therefor;
provided, however, that such Fundamental Change Purchase Price shall be so paid
pursuant to

                                      -22-

<PAGE>

this Section 3.8 only if the Security so delivered to the Paying Agent shall
conform in all respects to the description thereof set forth in the related
Fundamental Change Purchase Notice.

     The Company shall repurchase from the Holder thereof, pursuant to this
Section 3.8, a portion of a Security, so long as the principal amount of such
portion is $1,000 or an integral multiple of $1,000. Provisions of this
Indenture that apply to the repurchase of all of a Security also apply to the
repurchase of such portion of such Security.

     Notwithstanding anything contained herein to the contrary, any Holder
delivering to the Paying Agent the Fundamental Change Purchase Notice
contemplated by this Section 3.8 shall have the right to withdraw such
Fundamental Change Purchase Notice at any time prior to 5:00 p.m., New York City
time, on the fifth Business Day immediately preceding the Fundamental Change
Purchase Date by delivery of a written notice of withdrawal to the Paying Agent
in accordance with Section 3.8(f).

     The Paying Agent shall promptly notify the Company of the receipt by it of
any Fundamental Change Purchase Notice or written notice of withdrawal thereof.

     (e) Upon receipt by the Paying Agent of the Fundamental Change Purchase
Notice specified in Section 3.8(b), the Holder of the Security in respect of
which such Fundamental Change Purchase Notice was given shall (unless such
Fundamental Change Purchase Notice is withdrawn as specified in Section 3.8(f))
thereafter be entitled to receive solely the Fundamental Change Purchase Price
with respect to such Security. Such Fundamental Change Purchase Price shall be
paid to such Holder, subject to receipt of cash, shares of Common Stock or a
combination thereof, at the Company's election, by the Paying Agent, promptly
following the later of (a) the Fundamental Change Purchase Date with respect to
such Security (provided that he conditions set forth in Section 3.8(c) have been
satisfied) and (b) the time of delivery of such Security to the Paying Agent by
the Holder thereof in the manner required by Section 3.8(c). Securities in
respect of which a Fundamental Change Purchase Notice has been given by the
Holder thereof may not be converted pursuant to Article 4 on or after the date
of the delivery of such Fundamental Change Purchase Notice unless such
Fundamental Change Purchase Notice has first been validly withdrawn as specified
in Section 3.8(f).

     (f) A Fundamental Change Purchase Notice may be withdrawn by means of a
written notice of withdrawal delivered to the office of the Paying Agent in
accordance with the Fundamental Change Purchase Notice at any time prior to 5:00
p.m., New York City time, on the fifth Business Day immediately preceding the
Fundamental Change Purchase Date, specifying:

          (1) the name of the Holder;

          (2) a statement that the Holder is withdrawing its election to require
     the Company to repurchase its Securities;

          (3) the certificate number, if any, of the Security in respect of
     which such notice of withdrawal is being submitted or, if the Security is
     not then issued as a Certificated Security, that the notice of withdrawal
     complies with the Applicable Procedures of the Depositary in effect at that
     time;

          (4) the principal amount of the Security with respect to which such
     notice of withdrawal is being submitted; and

                                      -23-

<PAGE>

          (5) the principal amount, if any, of such Security which remains
     subject to the original Fundamental Change Purchase Notice and which has
     been or will be delivered for repurchase by the Company, which must be an
     integral multiple of $1,000.

     (g) Prior to noon, New York City time, on the applicable Fundamental Change
Purchase Date, the Company shall deposit with the Paying Agent (or if the
Company or a Subsidiary or an Affiliate of any of them is acting as the Paying
Agent, shall segregate and hold in trust as provided in Section 2.4) an amount
of cash (in immediately available funds if deposited on such Fundamental Change
Purchase Date) or shares (or a combination thereof), as the case may be,
sufficient to pay the aggregate Fundamental Change Purchase Price of all the
Securities or portions thereof which are to be repurchased on such Fundamental
Change Purchase Date.

     If the Paying Agent holds, in accordance with the terms hereof, at noon,
New York City time, on the applicable Fundamental Change Purchase Date, cash or
shares (or a combination thereof), as the case may be, sufficient to pay the
Fundamental Change Purchase Price of any Securities for which a Fundamental
Change Fundamental Change Purchase Notice has been tendered and not withdrawn
pursuant to Section 3.8(f), then, immediately after such Fundamental Change
Purchase Date, such Securities will cease to be outstanding and interest on such
Securities will cease to accrue, whether or not such Securities are delivered to
the Paying Agent, and the rights of the Holders in respect thereof shall
terminate (other than the right to receive the Fundamental Change Purchase Price
upon delivery of such Securities).

     (h) Any Certificated Security which is to be repurchased only in part shall
be surrendered at the office of the Paying Agent (with, if the Company or the
Trustee so requires, due endorsement by, or a written instrument of transfer in
form satisfactory to the Company and the Trustee duly executed by, the Holder
thereof or such Holder's attorney duly authorized in writing) and the Company
shall execute and the Trustee shall authenticate and deliver to the Holder of
such Security, without charge, a new Security or Securities, of any authorized
denomination as requested by such Holder in aggregate principal amount equal to,
and in exchange for, the portion of the principal amount of the Security so
surrendered which is not repurchased.

SECTION 3.9. COMPANY PURCHASES OF SECURITIES.

     The Company may from time to time, to the extent permitted by applicable
law, purchase any or a certain amount of the Securities in the market on which
such Securities trade, or by commencing a tender offer under the rules and
regulations promulgated under the Securities Act and the Exchange Act, or by
entering into a private agreement with a third party. Any Security purchased by
the Company (a) after the date that is two years from the latest issuance of the
Securities may, to the extent permitted by applicable law, be reissued or sold
or may be surrendered to the Trustee for cancellation or (b) on or prior to the
date referred to in (a), will be surrendered to the Trustee for cancellation.
Any Securities surrendered to the Trustee may not be reissued or resold and will
be canceled promptly.

SECTION 3.10. REPAYMENT TO THE COMPANY.

     To the extent that the aggregate amount of cash, shares or a combination
thereof, deposited by the Company pursuant to this Article 3 exceeds the
aggregate payment thereon of the Securities or portions thereof that the Company
is obligated to purchase, then the Trustee or a Paying Agent, as the case may
be, shall promptly return any such excess to the Company.

                                      -24-

<PAGE>

SECTION 3.11. COMPLIANCE WITH SECURITIES LAWS.

     (a) When complying with the provisions of this Article 3 in respect of any
redemption, purchase or repurchase of the Securities, and subject to any
exemptions available under applicable law, the Company shall:

          (1) comply with Rule 13e-4 and Rule 14e-1 (or any successor provision)
     under the Exchange Act, as applicable;

          (2) file the related Schedule TO if required (or any successor
     schedule, form or report) under the Exchange Act, as applicable; and

          (3) otherwise comply with all federal and state securities laws so as
     to permit the rights and obligations under this Article 3 to be exercised
     in the time and in the manner specified therein.

     (b) To the extent that the provisions of any securities laws or regulations
conflict with the provisions of Article 3, the Company's compliance with such
laws and regulations shall not in and of itself cause a breach of its
obligations under this Article 3, but rather shall be deemed satisfaction
thereof.

SECTION 3.12. ELECTION TO PAY PURCHASE PRICE IN COMMON STOCK.

     (a) In addition to its other rights hereunder, the Company may, at its
option, elect to pay the purchase price for Securities of Holders who elect to
have their Securities purchased pursuant to Sections 3.7 and 3.8 in cash, shares
of Common Stock valued at a discount of 2.5% from the Market Price of Common
Stock, or any combination thereof. If the purchase is in connection with a
merger or similar transaction, the Company may, at its option, pay the purchase
price in securities or other consideration received by its stockholders in such
transaction. The Company may pay the purchase price in shares Common Stock only
if such shares are eligible for immediate sale in the public market by
non-affiliates of the Company. The Company will notify the holders of the
Securities upon the determination of the actual number of shares of Common Stock
deliverable upon any purchase of the Securities.

     (b) The Company's right to purchase Securities, in whole or in part, with
shares of Common Stock is subject to the satisfaction by the Company of the
following conditions:

          (1) the listing of such shares of Common Stock on the principal United
     States securities exchange on which the Common Stock is then listed or
     Nasdaq or, if not so listed, on the New York Stock Exchange;

          (2) the registration of the Common Stock under the Exchange Act, if
     required; and

          (3) any necessary qualification or registration under applicable state
     securities laws or the availability of an exemption from such qualification
     and registration.

     (c) If the Conditions specified in Section 3.12(b) are not satisfied with
respect to a Holder prior to the close of business on the Put Right Purchase
Date or the Fundamental Change Purchase Date, as the case may be, the Company
will pay the purchase price of such Holder's Securities entirely in cash unless
the Company's credit facilities or other contractual obligations prohibit it
from paying the purchase price in cash. The Company may not change the form or
components or percentages of components of consideration to be paid for the
Securities once it has given notice of such consideration to Holders of the
Securities, except as described in this Section 3.12(c).

                                      -25-

<PAGE>

     (d) The "Market Price" of Common Stock for purposes of Section 3.12 means
the average of the daily volume-weighted average price as reported by Bloomberg
or another recognized source of our Common Stock for the five trading-day period
ending on the third business day prior to the Put Right Purchase Date or the
Fundamental Change Purchase Date, as the case may be, (if the business day prior
to the purchase date is a trading day, or if not, then on the last trading day
prior to the third business day), appropriately adjusted to take into account
the occurrence, during the period commencing on the first trading day during the
five trading-day period and ending on such purchase date, of any event that
would result in an adjustment to the Conversion Rate.

     (e) The Company shall, in connection with repurchases of the Securities
pursuant to this Article 3, if then required by the Exchange Act, comply with
the provisions of Rule 13e-4, Rule 14e-1 and any other tender offer rules under
the Exchange Act that may then be applicable, including filing a Schedule TO if
required or any other required schedule under the Exchange Act.

     (f) Payment by the Company for the Securities is conditioned upon
book-entry transfer of or physical delivery of certificates representing the
Securities, together with necessary endorsements, to the Trustee or any Paying
Agent prior to the applicable repurchase date specified in the applicable
repurchase notice. Payment of the purchase price for tendered Securities will be
made within two Business Days after any such transfer or delivery on or after
the applicable purchase date.

                                    ARTICLE 4

                                   CONVERSION

SECTION 4.1. CONVERSION RIGHT.

     (a) Subject to the provisions of this Article 4, a Holder of a Security
shall have the right, at such Holder's option, to convert all or any portion (if
the portion to be converted is $1,000 or an integral multiple of $1,000) of such
Security into shares of Common Stock at the Conversion Rate in effect on the
date of conversion at any time at any time prior to the earlier of (1) the close
of business on the Business Day prior to the Redemption Date and (2) the close
of business on the second Business Day immediately preceding the Final Maturity
Date.

     (b) The Company may, at its sole descrition, deliver cash, shares of Common
Stock or a combination of cash and shares of Common Stock to a converting Holder
in accordance with the provisions of this Article 4.

SECTION 4.2. EXERCISE OF CONVERSION RIGHT.

     (a) To exercise the conversion right, the Holder of any Security to be
converted shall, in the case of Global Securities, comply with the Applicable
Procedures, and, in the case of Certificated Securities, surrender such Security
duly endorsed or assigned to the Company or in blank, at the office of any
Conversion Agent, accompanied by a duly signed conversion notice (a "Conversion
Notice") substantially in the form attached to the Security to the Company
stating that the Holder elects to convert such Security or, if less than the
entire principal amount thereof is to be converted, the portion thereof to be
converted.

     (b) In the case of any Certificated Security which is converted in part
only, upon such conversion the Company shall execute and the Trustee shall
authenticate and deliver to the Holder thereof, at the expense of the Company, a
new Security or Securities of authorized denominations in an aggregate principal
amount equal to the unconverted portion of the principal amount of such
Securities.

                                      -26-

<PAGE>

SECTION 4.3. COMPANY'S RIGHT TO ELECT TO PAY CASH OR COMMON STOCK.

     The Company may elect to pay Holders surrendering Securities an amount in
cash per Security (or a portion of a Security) equal to the Closing Price of
Common Stock for the ten consecutive Trading Days commencing on and including
the third Business Day following the Conversion Date multiplied by the
Conversion Rate in effect on the Conversion Date, or a combination of cash and
Common Stock. The Company will inform the Holders through the Trustee no later
than two Business Days following the Conversion Date of its election to pay cash
in lieu of delivery of Common Stock or to deliver a combination of cash and
Common Stock. If the Company elects to deliver all of such payment in Common
Stock, the Common Stock will be delivered by the Company through the Conversion
Agent no later than the third Business Day following the Conversion Date. If the
Company elects to pay all or a portion of such payment in cash, the payment,
including any delivery of Common Stock, will be made to Holders surrendering
Securities no later than the fifteenth Business Day following the applicable
Conversion Date.

SECTION 4.4. FRACTIONS OF SHARES.

     No fractional shares of Common Stock shall be issued upon conversion of any
Security or Securities. If more than one Security shall be surrendered for
conversion at one time by the same Holder, the number of full shares which shall
be issued upon conversion thereof shall be computed on the basis of the
aggregate principal amount of the Securities (or specified portions thereof) so
surrendered. Instead of any fractional shares of Common Stock which would
otherwise be issued upon conversion of any Security or Securities (or specified
portions thereof), the Company shall pay a cash adjustment in respect of such
fraction (calculated to the nearest one-100th of a share) in an amount equal to
the same fraction of the Closing Price per share of Common Stock as of the
Trading Day preceding the Conversion Date.

SECTION 4.5. CONVERSION PROCEDURE.

     (a) To convert a Security, a Holder must (1) complete and manually sign the
conversion notice on the back of the Security and deliver such notice to a
Conversion Agent, (2) surrender the Security to a Conversion Agent, (3) furnish
appropriate endorsements and transfer documents if required by a Registrar or a
Conversion Agent, and (4) pay all transfer or similar taxes, if required
pursuant to Section 4.9.

     (b) On conversion of a Security, a Holder will not receive, except as
described below, any cash payment representing any accrued interest. Instead,
accrued interest will be deemed paid by the shares of Common Stock (or any cash
in lieu thereof) received by the Holder on conversion. Delivery to the Holder of
the full number of shares of Common Stock into which the Security is convertible
(or any cash in lieu thereof), together with any cash payment of such Holder's
fractional shares, will thus be deemed to satisfy the Company's obligation to
pay the principal amount of a Security and to satisfy the Company's obligation
to pay accrued and unpaid interest. As a result, accrued interest is deemed paid
in full rather than cancelled, extinguished or forfeited.

SECTION 4.6. ADJUSTMENT OF CONVERSION RATE.

     (a) In case the Company shall hereafter pay a dividend or make a
distribution to all holders of the outstanding Common Stock in shares of Common
Stock, the Conversion Rate shall be increased so that the same shall equal the
rate determined by multiplying the Conversion Rate in effect at the opening of
business on the date following the date fixed for the determination of
stockholders of the Company entitled to receive such dividend or other
distribution by a fraction,

                                      -27-

<PAGE>

          (1) the numerator of which shall be the sum of the number of shares of
     Common Stock outstanding at the close of business on the date fixed for the
     determination of stockholders of the Company entitled to receive such
     dividend or other distribution plus the total number of shares of Common
     Stock constituting such dividend or other distribution; and

          (2) the denominator of which shall be the number of shares of Common
     Stock outstanding at the close of business on the date fixed for such
     determination,

such increase to become effective immediately at the opening of business on the
day following the date fixed for such determination. If any dividend or
distribution of the type described in this Section 4.6(a) is declared but not so
paid or made, the Conversion Rate shall again be adjusted to the Conversion Rate
that would then be in effect if such dividend or distribution had not been
declared.

     (b) In case outstanding shares of Common Stock shall be subdivided into a
greater number of shares of Common Stock, the Conversion Rate in effect at the
opening of business on the day following the day upon which such subdivision
becomes effective shall be proportionately increased, and conversely, in case
outstanding shares of Common Stock shall be combined into a smaller number of
shares of Common Stock, the Conversion Rate in effect at the opening of business
on the day following the day upon which such combination becomes effective shall
be proportionately reduced, such increase or reduction, as the case may be, to
become effective immediately after the opening of business on the day following
the day upon which such subdivision or combination becomes effective.

     (c) In case the Company shall issue rights or warrants to all holders of
its outstanding shares of Common Stock entitling them to subscribe for or
purchase, for a period expiring within 45 days of the record date of such
issuance, shares of Common Stock at a price per share less than the Current
Market Price as of the record date fixed for determination of stockholders of
the Company entitled to receive such rights or warrants, the Conversion Rate
shall be increased so that the same shall equal the rate determined by
multiplying the Conversion Rate in effect immediately prior to the date fixed
for determination of stockholders of the Company entitled to receive such rights
or warrants by a fraction,

          (1) the numerator of which shall be the number of shares of Common
     Stock outstanding on the record date fixed for determination of
     stockholders of the Company entitled to receive such rights or warrants
     plus the total number of additional shares of Common Stock offered for
     subscription or purchase, and

          (2) the denominator of which shall be the sum of the number of shares
     of Common Stock outstanding at the close of business on the record date
     fixed for determination of stockholders of the Company entitled to receive
     such rights or warrants plus the number of shares that the aggregate
     offering price of the total number of shares so offered would purchase at a
     price equal to the Current Market Price as of the date immediately
     preceding the record date fixed for determination of stockholders of the
     Company entitled to receive such rights or warrants.

     Such adjustment shall be successively made whenever any such rights or
warrants are issued, and shall become effective immediately after the opening of
business on the day following the date fixed for determination of stockholders
of the Company entitled to receive such rights or warrants. To the extent that
shares of Common Stock are not delivered after the expiration of such rights or
warrants, the Conversion Rate shall be readjusted to the Conversion Rate that
would then be in effect had the adjustments made upon the issuance of such
rights or warrants been made on the basis of delivery of only the number of
shares of Common Stock actually delivered. If such rights or warrants are not so
issued, the Conversion Rate shall again be adjusted to be the Conversion Rate
that would then be in effect if such date fixed for the determination of
stockholders of the Company entitled to receive such rights or warrants

                                      -28-

<PAGE>

had not been fixed. In determining whether any rights or warrants entitle the
holders to subscribe for or purchase shares of Common Stock at a price less than
the Current Market Price as of the record date fixed for determination of
stockholders of the Company entitled to receive such rights or warrants, and in
determining the aggregate offering price of such shares of Common Stock, there
shall be taken into account any consideration received by the Company for such
rights or warrants and any amount payable on exercise or conversion thereof, the
value of such consideration, if other than cash, to be determined by the Board
of Directors.

     (d) In case the Company shall, by dividend or otherwise, distribute to all
holders of its Common Stock assets, debt securities, shares of any class of
Capital Stock of the Company or rights or warrants to purchase any securities of
the Company excluding (x) any dividend or distribution or issuance referred to
in Section 4.6(c), (y) any dividends or distributions in connection with a
reclassification, change, consolidation, merger, sale or conveyance for which
the consideration payable upon conversion of the Securities shall be changed in
accordance with Section 4.8 and (z) any dividend or distribution referred to in
Section 4.6(e) (any of the foregoing hereinafter in this Section 4.6(d) referred
to as "Distributed Assets or Securities"), then, in each such case, the
Conversion Rate shall be increased so that the same shall be equal to the rate
determined by multiplying the Conversion Rate in effect on the Record Date with
respect to such distribution by a fraction,

          (1) the numerator of which shall be the Current Market Price on such
     Record Date plus the Fair Market Value (as determined by the Board of
     Directors, whose determination shall be conclusive, and described in a
     resolution of the Board of Directors) on the Record Date of the portion of
     the Distributed Assets or Securities so distributed applicable to one share
     of Common Stock; and

          (2) the denominator of which shall be the Current Market Price on such
     Record Date,

such adjustment to become effective immediately prior to the opening of business
on the day following such Record Date. If such dividend or distribution is not
so paid or made, the Conversion Rate shall again be adjusted to be the
Conversion Rate that would then be in effect if such dividend or distribution
had not been declared. If the Board of Directors determines the Fair Market
Value of any distribution for purposes of this Section 4.6(d) by reference to
the actual or when issued trading market for any securities, it must in doing so
consider the prices in such market over the same period used in computing the
Current Market Price on the applicable Record Date.

     Rights or warrants distributed by the Company to all holders of Common
Stock (including, without limitation, rights issued pursuant to any rights
agreement) entitling the holders thereof to subscribe for or purchase shares of
the Company's capital stock (either initially or under certain circumstances),
which rights or warrants, until the occurrence of a specified event or events
("Trigger Event"): (i) are deemed to be transferred with such shares of Common
Stock; (ii) are not exercisable; and (iii) are also issued in respect of future
issuances of Common Stock, shall be deemed not to have been distributed for
purposes of this Section 4.6 (and no adjustment to the Conversion Rate will be
required) until the occurrence of the earliest Trigger Event, whereupon such
rights and warrants shall be deemed to have been distributed and an appropriate
adjustment (if any is required) to the Conversion Rate shall be made under this
Section 4.6(d). If any such right or warrant, including any such existing rights
or warrants distributed prior to the date of this Indenture, are subject to
events, upon the occurrence of which such rights or warrants become exercisable
to purchase different securities, evidences of indebtedness or other assets,
then the date of the occurrence of any and each such event shall be deemed to be
the date of distribution and record date with respect to new rights or warrants
with such rights (and a termination or expiration of the existing rights or
warrants without exercise by any of the holders thereof). In addition, in the
event of any distribution (or deemed distribution) of rights or warrants, or any
Trigger Event or

                                      -29-

<PAGE>

other event (of the type described in the preceding sentence) with respect
thereto that was counted for purposes of calculating a distribution amount for
which an adjustment to the Conversion Rate under this Section 4.6 was made, (1)
in the case of any such rights or warrants that shall all have been redeemed or
repurchased without exercise by any holders thereof, the Conversion Rate shall
be readjusted upon such final redemption or repurchase to give effect to such
distribution or Trigger Event, as the case may be, as though it were a cash
distribution, equal to the per share redemption or repurchase price received by
a holder or holders of Common Stock with respect to such rights or warrants
(assuming such holder had retained such rights or warrants), made to all holders
of Common Stock as of the date of such redemption or repurchase, and (2) in the
case of such rights or warrants that shall have expired or been terminated
without exercise thereof, the Conversion Rate shall be readjusted as if such
expired or terminated rights and warrants had not been issued.

     For purposes of this Section 4.6(d) and Sections 4.6(a) and (c), any
dividend or distribution to which this Section 4.6(d) is applicable that also
includes shares of Common Stock, or rights or warrants to subscribe for or
purchase shares of Common Stock described in Section 4.6(a) or 4.6(c) (or both),
shall be deemed instead to be (1) a dividend or distribution of the evidences of
assets, debt securities or shares of capital stock other than such shares of
Common Stock or rights or warrants (and any Conversion Rate adjustment required
by this Section 4.6(d) with respect to such dividend or distribution shall then
be made) immediately followed by (2) a dividend or distribution of such shares
of Common Stock or such rights or warrants (and any further Conversion Rate
adjustment required by Sections 4.6(a) and 4.6(c) with respect to such dividend
or distribution shall then be made), except (A) the Record Date of such dividend
or distribution shall be substituted as "the date fixed for the determination of
stockholders of the Company entitled to receive such dividend or other
distribution," "the date fixed for the determination of stockholders of the
Company entitled to receive such rights or warrants" and "the date fixed for
such determination" within the meaning of Sections 4.6(a) and 4.6(c) and (B) any
shares of Common Stock included in such dividend or distribution shall not be
deemed "outstanding at the close of business on the date fixed for such
determination" within the meaning of Section 4.6(a).

     (e) In case the Company shall, by dividend or otherwise, make distributions
consisting exclusively of cash to all holders of its Common Stock, then, in such
case, the Conversion Rate shall be increased so that the same shall equal the
rate determined by multiplying the Conversion Rate in effect immediately prior
to the close of business on such record date by a fraction,

          (1) the numerator of which shall be the Current Market Price on such
     record date; and

          (2) the denominator of which shall be the Current Market Price minus
     the amount of aggregate cash dividends applicable to one share of Common
     Stock on such record date,

such adjustment to be effective immediately prior to the opening of business on
the day following the record date. If such dividend or distribution is not so
paid or made, the Conversion Rate shall again be adjusted to be the Conversion
Rate that would then be in effect if such dividend or distribution had not been
declared. If an adjustment is required to be made as set forth in this Section
4.6(e) as a result of a distribution that is not a cash dividend, such
adjustment shall be based upon the full amount of the distribution.

     (f) In case a tender or exchange offer made by the Company or any of its
Subsidiaries for all or any portion of the Common Stock shall expire and such
tender or exchange offer (as amended upon the expiration thereof) shall require
the payment to stockholders of the Company of consideration per share of Common
Stock having a Fair Market Value (as determined by the Board of Directors, whose
determination shall be conclusive and described in a resolution of the Board of
Directors) that as of the

                                      -30-

<PAGE>

last time (the "Expiration Time") tenders or exchanges may be made pursuant to
such tender or exchange offer (as it may be amended) exceeds the Closing Price
of a share of Common Stock on the Trading Day next succeeding the Expiration
Time, the Conversion Rate shall be increased so that the same shall equal the
rate determined by multiplying the Conversion Rate in effect immediately prior
to the Expiration Time by a fraction,

          (1) the numerator of which shall be the sum of (x) the Fair Market
     Value (determined as aforesaid) of the aggregate consideration payable to
     stockholders of the Company based on the acceptance (up to any maximum
     specified in the terms of the tender or exchange offer) of all shares
     validly tendered or exchanged and not withdrawn as of the Expiration Time
     (the shares deemed so accepted up to any such maximum, being referred to as
     the "Purchased Shares") and (y) the product of the number of shares of
     Common Stock outstanding (less any Purchased Shares) at the Expiration Time
     and the Closing Price of a share of Common Stock on the Trading Day next
     succeeding the Expiration Time, and

          (2) the denominator of which shall be the number of shares of Common
     Stock outstanding (including any Purchased Shares) at the Expiration Time
     multiplied by the Closing Price of a share of Common Stock on the Trading
     Day next succeeding the Expiration Time,

such adjustment to become effective immediately prior to the opening of business
on the day following the Expiration Time. If the Company is obligated to
purchase shares pursuant to any such tender or exchange offer, but the Company
is permanently prevented by applicable law from effecting any such purchases or
all such purchases are rescinded, the Conversion Rate shall again be adjusted to
be the Conversion Rate that would then be in effect if such tender or exchange
offer had not been made.

     (g) Notwithstanding anything to the contrary, in the event of an adjustment
to the Conversion Rate pursuant to Section 4.6(e) or (f), in no event will the
Conversion Rate for any series of Securities exceed 51.8134 (the "Maximum
Conversion Rate"). The Maximum Conversion Rate is subject to the same
proportional adjustments made to the Conversion Rate pursuant to Section 4.6(a),
(b), (c) or (d).

     (h) For purposes of this Section 4.6, the following terms shall have the
meaning indicated:

          (1) "Current Market Price" shall mean, for purposes of any dividend or
     distribution requiring adjustment under Section 4.6(d) or Section 4.6(e),
     the average of the sale price of Common Stock for each of the 5 consecutive
     Trading Days ending on the earlier of the Business Day in question and the
     Business Day before the Ex-Dividend Date with respect to the dividend or
     distribution requiring such computation.

          If another dividend or distribution to which this Section 4.6 applies
     occurs during the period applicable for calculating "Current Market Price"
     pursuant to the definition in the preceding paragraph, "Current Market
     Price" shall be calculated for such period in a manner determined by the
     Board of Directors, whose determination shall be conclusive, to reflect the
     impact of such dividend or distribution on the Closing Price of the Common
     Stock during such period.

          (2) "Fair Market Value" shall mean the amount which a willing buyer
     would pay a willing seller in an arm's-length transaction.

          (3) "Record Date" shall mean, with respect to any dividend,
     distribution or other transaction or event in which the holders of Common
     Stock have the right to receive any cash, securities or other property or
     in which the Common Stock (or other applicable security) is

                                      -31-

<PAGE>

     exchanged for or converted into any combination of cash, securities or
     other property, the date fixed for determination of stockholders of the
     Company entitled to receive such cash, securities or other property
     (whether such date is fixed by the Board of Directors or by statute,
     contract or otherwise).

     (i) The Company may make such reductions in the Conversion Rate in addition
to those otherwise required by this Section 4.6 as the Board of Directors, whose
determination shall be conclusive, considers to be advisable to avoid or
diminish any income tax to holders of Common Stock or rights to purchase Common
Stock resulting from any dividend or distribution of stock (or rights to acquire
stock) or from any event treated as such for income tax purposes.

     To the extent permitted by applicable law, the Company from time to time
may increase the Conversion Rate for any series of Securities by any amount for
any period of time if the period is at least 20 days, the increase is
irrevocable during the period and the Board of Directors shall have made a
determination that such increase would be in the best interests of the Company,
which determination shall be conclusive. Whenever the Conversion Rate is
increased pursuant to the preceding sentence, the Company shall mail to Holders
a notice of the increase at least 15 days prior to the date the increased
Conversion Rate takes effect, and such notice shall state the increased
Conversion Rate and the period during which it will be in effect.

     (j) No adjustment in the Conversion Rate for any series of Securities shall
be required unless such adjustment would require an increase or decrease of at
least one percent (1%) in such rate; provided that any adjustments that by
reason of this Section 4.6(j) are not required to be made shall be carried
forward and taken into account in any subsequent adjustment. All calculations
under this Article 4 shall be made by the Company and shall be made to the
nearest cent or to the nearest one-ten thousandth (1/10,000) of a share, as the
case may be.

     (k) No adjustment to the Conversion Rate need be made for a transaction
referred to in this Article 4 if Holders are to participate in the transaction
without conversion on a basis and with notice that the Board of Directors
determines in good faith to be fair and appropriate in light of the basis and
notice on which holders of Common Stock participate in the transaction (which
determination shall be described in a Board Resolution).

     (l) For purposes of this Section 4.6, the number of shares of Common Stock
at any time outstanding shall not include shares held in the treasury of the
Company, unless such treasury shares participate in any distribution or dividend
that requires an adjustment pursuant to this Section 4.6, but shall include
shares issuable in respect of scrip certificates issued in lieu of fractions of
shares of Common Stock.

SECTION 4.7. NOTICE OF ADJUSTMENT.

     (a) Whenever an adjustment in the Conversion Rate with respect to the
Securities is required:

          (1) the Company shall forthwith place on file with the Trustee and any
     Conversion Agent for such Securities a certificate of the Treasurer of the
     Company stating the adjusted Conversion Rate determined as provided herein
     and setting forth in reasonable detail such facts as shall be necessary to
     show the reason for and the manner of computing such adjustment; and

          (2) a notice stating that the Conversion Rate has been adjusted and
     setting forth the adjusted Conversion Rate shall forthwith be given by the
     Company or, at the Company's request, by the Trustee in the name and at the
     expense of the Company, to each Holder. Any notice so

                                      -32-

<PAGE>

     given shall be conclusively presumed to have been duly given, whether or
     not the Holder receives such notice.

     (b) If the Company takes any action, or becomes aware of an event, that
would require an adjustment to the Conversion Rate as described in Sections
4.6(a), (b), (c), (d), (e) and (f), the Company shall mail to Holders a written
notice of such action or event at least 20 days prior to the record, effective
or expiration date, as the case may be, of the transaction, unless such notice,
relating to the same event, has already been provided to Holders pursuant to
clause (a)(2) of this Section 4.7.

SECTION 4.8. CONSOLIDATION OR MERGER OF THE COMPANY.

     If any of the following events occurs:

          (a) any reclassification or change of the outstanding Common Stock
     into another class of Capital Stock (other than a change in par value, or
     from par value to no par value, or from no par value to par value, or as a
     result of a subdivision or combination);

          (b) any merger, consolidation, statutory share exchange or combination
     of the Company with another corporation as a result of which all of the
     holders of Common Stock shall be entitled to receive stock, securities or
     other property or assets (including cash or any combination thereof) with
     respect to or in exchange for all of their Common Stock; or

          (c) any sale or conveyance of all or substantially all the properties
     and assets of the Company to any other person as a result of which all of
     the holders of Common Stock shall be entitled to receive stock, securities
     or other property or assets (including cash or any combination thereof)
     with respect to or in exchange for all of their Common Stock;

in each case as a result of which holders of Common Stock are entitled to
receive stock, other securities, other property or assets (including cash or any
combination thereof) with respect to or in exchange for Common Stock, the
Company shall execute with the Trustee a supplemental indenture (which shall
comply with the TIA as in force at the date of execution of such supplemental
indenture, if such supplemental indenture is then required to so comply)
providing that the Holder's right to convert a Security into Common Stock shall
be changed to a right to convert a Security into the kind and amount of shares
of stock and other securities or property or assets (including cash) which such
Holder would have been entitled to receive upon such reclassification, change,
merger, consolidation, statutory share exchange, combination, sale or conveyance
had such Securities been converted into Common Stock immediately prior to such
reclassification, change, merger, consolidation, statutory share exchange,
combination, sale or conveyance. In the event holders of Common Stock have the
opportunity to elect the form of consideration to be received in a
reclassification, change, consolidation, merger, combination, sale or
conveyance, the Company shall make adequate provision whereby the Holders of the
Securities shall have the opportunity, on a timely basis, to determine the form
of consideration into which all of the Securities, treated as a single class,
shall be convertible. Such determination shall be based on the blended, weighted
average of elections made by Holders of the Securities who participate in such
determination and shall be subject to any limitations to which all of the
holders of Common Stock are subject to, such as pro-rata reductions applicable
to any portion of the consideration payable.

     The Company shall cause notice of the execution of such supplemental
indenture to be mailed to each Holder, at the address of such Holder as it
appears on the register of the Securities maintained by the Primary Registrar,
within 20 days after execution thereof. Failure to deliver such notice shall not
affect the legality or validity of such supplemental indenture.

                                      -33-

<PAGE>

     The above provisions of this Section 4.8 shall similarly apply to
successive reclassifications, changes, mergers, consolidations, statutory share
exchanges, combinations, sales and conveyances.

     If this Section 4.8 applies to any event or occurrence, Section 4.6 shall
not apply.

SECTION 4.9. TAXES ON CONVERSION.

     The Holder shall pay any and all documentary, stamp or similar issue or
transfer taxes that may be payable in respect of the issue or delivery of shares
of Common Stock on conversion of Securities pursuant hereto.

     Nothing contained herein shall preclude any income tax withholding required
by law or regulation upon conversion of the Securities. Upon surrender of a
Security for conversion, the Holder shall deliver to the Company cash in an
amount equal to the applicable income tax withholding in connection with such
conversion; provided, however, that if the Holder does not deliver such cash,
the Company may deduct and withhold from the consideration otherwise deliverable
to such Holder the amount required to be so withheld.

SECTION 4.10. CONVERSION AFTER RECORD DATE.

     Except as provided in this Section 4.10, a converting Holder of Securities
shall not be entitled to receive any accrued and unpaid interest (including
Liquidated Damages, if any) on any such Securities being converted. By delivery
to the Holder of the number of shares of Common Stock or other consideration
issuable or payable upon conversion in accordance with this Article 4, any
accrued and unpaid interest (including Liquidated Damages, if any) on such
Securities will be deemed to have been paid in full. If any Securities are
surrendered for conversion subsequent to the Record Date preceding an Interest
Payment Date but prior to such Interest Payment Date, the Holder of such
Securities at the close of business on such Record Date shall receive the
interest payable on such Security on such Interest Payment Date notwithstanding
the conversion thereof. Securities surrendered for conversion during the period
from the close of business on any Record Date preceding any Interest Payment
Date to the opening of business on such Interest Payment Date shall (except in
the case of Securities which have been called for redemption on a Redemption
Date within such period) be accompanied by payment from converting Holders, for
the account of the Company, in New York Clearing House funds or other funds, of
an amount equal to the interest payable on such Interest Payment Date (excluding
any overdue interest, if applicable) on the Securities being surrendered for
conversion; provided, however, if the Company elects to redeem Securities on a
date that is after the Regular Record Date but prior to the corresponding
Interest Payment Date, and such Holder elects to convert those Securities, the
Holder will not be required to pay the Company, at the time that Holder
surrenders those Securities for conversion, the amount of interest such Holder
will have received on the Interest Payment Date.

SECTION 4.11. COMPANY DETERMINATION FINAL.

     Any determination that the Company or the Board of Directors must make
pursuant to this Article 4 shall be conclusive if made in good faith and in
accordance with the provisions of this Article, absent manifest error, and set
forth in a Board Resolution.

SECTION 4.12. RESPONSIBILITY OF TRUSTEE FOR CONVERSION PROVISIONS.

     The Trustee has no duty to determine when an adjustment under this Article
4 should be made, how it should be made or what it should be. Unless and until a
Trust Officer of the Trustee receives a certificate delivered pursuant to
Section 4.7 setting forth an adjustment of the Conversion Rate, the

                                      -34-

<PAGE>

Trustee may assume without inquiry that no such adjustment has been made and
that the last Conversion Rate of which the Trustee has knowledge remains in
effect. The Trustee makes no representation as to the validity or value of any
securities or assets issued upon conversion of Securities. The Trustee shall not
be responsible for any failure of the Company to comply with this Article 4.
Each Conversion Agent other than the Company shall have the same protection
under this Section 4.12 as the Trustee.

     The rights, privileges, protections, immunities and benefits given to the
Trustee under this Indenture including, without limitation, its rights to be
indemnified, are extended to, and shall be enforceable by, the Trustee in each
of its capacities hereunder, and each Paying Agent or Conversion Agent acting
hereunder.

SECTION 4.13. UNCONDITIONAL RIGHT OF HOLDERS TO CONVERT.

     Notwithstanding any other provision in this Indenture, the Holder of any
Security shall have the right, which is absolute and unconditional, to convert
its Security in accordance with this Article 4 and to bring an action for the
enforcement of any such right to convert, and such rights shall not be impaired
or affected without the consent of such Holder.

SECTION 4.14. REPAYMENT TO THE COMPANY.

     To the extent that the aggregate amount of cash deposited by the Company
pursuant to this Article 4, if applicable, exceeds the aggregate payment thereon
of the Securities or portions thereof that the Company is obligated to purchase,
then the Trustee or a Paying Agent, as the case may be, shall promptly return
any such excess cash to the Company.

SECTION 4.15. MAKE-WHOLE PREMIUM.

     (a) If a transaction described in the definition of "Change in Control"
occurs on or prior to October 5, 2015, Holders who convert Securities in
accordance with the provisions of this Article 4 in connection with such
transaction shall be entitled to receive a "Make-Whole Premium" consisting of an
increase in the Conversion Rate. The Make-Whole Premium shall be calculated by
the Company and paid for in shares of Common Stock or, at the election of the
Company under Section 4.3, cash or a combination of cash and shares of Common
Stock. The number of additional shares of Common Stock by which the Conversion
Rate shall increase shall be determined by reference to the table below and
shall equal the number of shares of Common Stock for the applicable Fundamental
Change Effective Date and Stock Price (as set forth in such table) of such
transaction. If the applicable Fundamental Change Effective Date and/or Stock
Price is not set forth in the table then:

          (1) if the applicable Fundamental Change Effective Date and/or Stock
     Price is between two Fundamental Change Effective Dates or Stock Prices, as
     the case may be, set forth in the table, the Make-Whole Premium shall be
     determined by a straight-line interpolation between the Make-Whole Premiums
     set forth for the two Fundamental Change Effective Dates and/or Stock
     Prices, as the case may be, set forth in the table based on a 365-day year;

          (2) if the Stock Price on the Fundamental Change Effective Date
     exceeds $75.00 a share, subject to adjustment as set forth herein, no
     Make-Whole Premium shall be paid; and

          (3) if the Stock Price on the Fundamental Change Effective Date is
     less than $19.30 a share, subject to adjustment as set forth herein, no
     Make-Whole Premium shall be paid.

                                      -35-

<PAGE>

<TABLE>
<CAPTION>
                                               STOCK PRICE ON EFFECTIVE DATE
                      -------------------------------------------------------------------------------
EFFECTIVE DATE         $19.30   $21.00   $23.00   $25.00   $30.00   $35.00   $40.00   $50.00   $75.00
--------------        -------   ------   ------   ------   ------   ------   ------   ------   ------
<S>                   <C>       <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>
September 30, 2005    10.3626   9.3277   8.4459   7.5743   6.0015   4.8230   3.9725   2.7749   1.1579
October 5, 2006       10.3626   8.1632   7.2509   6.5720   5.2160   4.2049   3.4869   2.4553   1.0872
October 5, 2007       10.3626   6.7262   5.9638   5.3504   4.2336   3.4565   2.8699   2.0444   0.9482
October 5, 2008       10.3626   6.1682   4.3243   3.8434   3.0763   2.5226   2.1010   1.5158   0.7325
October 5, 2009       10.3626   6.1682   2.0275   2.0501   1.6833   1.3791   1.1544   0.8395   0.4196
October 5, 2010       10.3626   6.1682   3.0979   1.1780       --       --       --       --       --
October 5, 2011       10.3626   6.1682   2.0275   1.1723       --       --       --       --       --
October 5, 2012       10.3626   6.1682   3.0695   1.0715       --       --       --       --       --
October 5, 2013       10.3626   6.1682   2.9366   0.9885       --       --       --       --       --
October 5, 2014       10.3626   6.1682   2.3085   0.9761       --       --       --       --       --
October 5, 2015            --       --       --       --       --       --       --       --       --
</TABLE>

The Stock Prices set forth in the table above shall be adjusted as of any date
on which the Conversion Rate of the Securities is adjusted (other than any
increase to the Conversion Rate for a Change in Control as described in this
Section 4.15) by multiplying each such Stock Price in effect immediately prior
to such adjustment by a fraction, the numerator of which shall be the Conversion
Rate in effect immediately prior to the adjustment giving rise to the Stock
Price adjustment and the denominator of which shall be the Conversion Rate as so
adjusted. The number of additional shares set forth in the table above shall be
adjusted in the same manner as the Conversion Rate as set forth in Section 4.6.

     Delivery of the payment of the Make-Whole Premium shall be upon the later
of (x) the settlement date of the conversion of Securities by the Holder and (y)
promptly following the Fundamental Change Effective Date.

     (b) A conversion of Securities by a Holder will be deemed for the purposes
of this Section 4.15 to be "in connection with" a Fundamental Change if the
Conversion Notice delivered by the Holder pursuant to Section 4.2(a) hereof is
received by a Conversion Agent (i) on or subsequent to the date that is 15
Business Days prior to the date announced by the Company as the anticipated
Fundamental Change Effective Date but (ii) prior to the close of business on the
Business Day immediately preceding the related Fundamental Change Purchase Date.
The Company shall notify the Holders of an anticipated Fundamental Change
Effective Date no later than two Business Days after becoming aware of such
Fundamental Change Effective Date, but in no event shall the Company be required
to give more than 20 Business Days notice of an anticipated Fundamental Change
Effective Date.

     (c) Notwithstanding any of the provisions of this Section 4.15, in no event
shall the Conversion Rate exceed 51.8134 shares per $1,000 principal amount of
Securities (subject to adjustment as provided herein).

                                   ARTICLE 5

                                    COVENANTS

SECTION 5.1. PAYMENT OF SECURITIES.

     The Company shall promptly make all payments in respect of the Securities
on the dates and in the manner provided in the Securities and this Indenture. An
installment of principal or interest or Liquidated Damages, if any, shall be
considered paid on the date it is due if the Paying Agent (other than the
Company) holds by noon, New York City time, on that date money, deposited by the
Company or an Affiliate thereof, sufficient to pay the installment. The Company
shall, (in immediately available funds) to the fullest extent permitted by law,
pay interest on overdue principal (including premium, if any) and overdue
installments of interest at the rate borne by the Securities per annum.

     Payment of the principal of (and premium, if any) and any interest on the
Securities shall be made at the office or agency of the Company maintained for
that purpose in the Borough of Manhattan, The

                                      -36-

<PAGE>

City of New York (which shall initially be U.S. Bank Trust National Association,
an Affiliate of the Trustee, as agent of the Trustee) or at the Corporate Trust
Office of the Trustee in such coin or currency of the United States of America
as at the time of payment is legal tender for payment of public and private
debts; provided, however, that at the option of the Company payment of interest
may be made by check mailed to the address of the Person entitled thereto as
such address appears in the register of Securities maintained by the Primary
Registrar; provided, further, that a Holder with an aggregate principal amount
in excess of $5,000,000 will be paid by wire transfer in immediately available
funds at the election of such Holder if such Holder has provided wire transfer
instructions to the Company at least 10 Business Days prior to the payment date.

SECTION 5.2. SEC REPORTS.

     The Company and Guarantors shall provide to the Trustee all reports and
other information and documents which they are required to file with the SEC
pursuant to Section 13 or 15(d) of the Exchange Act, after the filing thereof,
and shall make such reports and other information and documents available on
their respective websites to the extent required by law.

     The Company and Guarantors shall annually provide the Trustee with copies
of their most recent annual reports to stockholders, promptly after such annual
reports are mailed to holders of the their Common Stock. Delivery of such
reports, information and documents to the Trustee is for informational purposes
only and the Trustee's receipt of such shall not constitute constructive notice
of any information contained therein or determinable from information contained
therein, including the Company's and Guarantors' compliance with any of their
covenants hereunder (as to which the Trustee is entitled to rely exclusively on
Officers' Certificates).

SECTION 5.3. COMPLIANCE CERTIFICATES.

     The Company shall deliver to the Trustee, within 90 days after the end of
each fiscal year of the Company (beginning with the fiscal year ending December
31, 2005), an Officers' Certificate as to the signer's knowledge of the
Company's compliance with all conditions and covenants on its part contained in
this Indenture and stating whether or not the signer knows of any default or
Event of Default. If such signer knows of such a default or Event of Default,
the Officers' Certificate shall describe the default or Event of Default and the
efforts to remedy the same. For the purposes of this Section 5.3, compliance
shall be determined without regard to any grace period or requirement of notice
provided pursuant to the terms of this Indenture.

SECTION 5.4. FURTHER INSTRUMENTS AND ACTS.

     Upon request of the Trustee, the Company will execute and deliver such
further instruments and do such further acts as may be reasonably necessary or
proper to carry out more effectively the purposes of this Indenture.

SECTION 5.5. MAINTENANCE OF CORPORATE EXISTENCE.

     Subject to Article 6, the Company will do or cause to be done all things
necessary to preserve and keep in full force and effect its existence as a
corporation.

SECTION 5.6. RULE 144A INFORMATION REQUIREMENT.

     Within the period prior to the expiration of the holding period applicable
to sales thereof under Rule 144(k) under the Securities Act (or any successor
provision), the Company covenants and agrees

                                      -37-

<PAGE>

that it shall, during any period in which it is not subject to Section 13 or
15(d) under the Exchange Act, upon the request of any Holder or beneficial
holder of the Securities make available to such Holder or beneficial holder of
Securities or any Shares of Common Stock issued upon conversion thereof which
continue to be Transfer Restricted Securities in connection with any sale
thereof and any prospective purchaser of Securities or such Common Stock
designated by such Holder or beneficial holder, the information required
pursuant to Rule 144A(d)(4) under the Securities Act and it will take such
further action as any Holder or beneficial holder of such Securities or such
Common Stock may reasonably request, all to the extent required from time to
time to enable such Holder or beneficial holder to sell its Securities or Common
Stock without registration under the Securities Act within the limitation of the
exemption provided by Rule 144A, as such Rule may be amended from time to time.
Upon the request of any Holder or any beneficial holder of the Securities or
such Common Stock, the Company will deliver to such Holder a written statement
as to whether it has complied with such requirements.

SECTION 5.7. STAY, EXTENSION AND USURY LAWS.

     The Company covenants (to the extent that it may lawfully do so) that it
shall not at any time insist upon, plead, or in any manner whatsoever claim or
take the benefit or advantage of, any stay, extension or usury law or other law
which would prohibit or forgive the Company from paying all or any portion of
the principal of, premium, if any, or interest (including Liquidated Damages, if
any) on the Securities as contemplated herein, wherever enacted, now or at any
time hereafter in force, or which may affect the covenants or the performance of
this Indenture, and the Company (to the extent it may lawfully do so) hereby
expressly waives all benefit or advantage of any such law and covenants that it
will not, by resort to any such law, hinder, delay or impede the execution of
any power herein granted to the Trustee, but will suffer and permit the
execution of every such power as though no such law had been enacted.

SECTION 5.8. PAYMENT OF LIQUIDATED DAMAGES.

     If Liquidated Damages are payable by the Company pursuant to the
Registration Rights Agreement, the Company shall deliver to the Trustee a
certificate to that effect stating (i) the amount of such Liquidated Damages
that are payable (ii) the reason why such Liquidated Damages are payable and
(iii) the date on which such Liquidated Damages are payable. Unless and until a
Trust Officer of the Trustee receives such a certificate, the Trustee may assume
without inquiry that no such Liquidated Damages are payable. If the Company has
paid Liquidated Damages directly to the Persons entitled to it, the Company
shall deliver to the Trustee a certificate setting forth the particulars of such
payment.

                                   ARTICLE 6

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 6.1. COMPANY MAY CONSOLIDATE, ETC., ONLY ON CERTAIN TERMS.

     The Company shall not consolidate with or merge into any other Person (in a
transaction in which the Company is not the surviving corporation) or convey,
transfer, lease or otherwise dispose of all or substantially all of its
properties and assets to any Person, whether in a single transaction or series
of related transactions, unless:

          (a) either (i) the Company is the surviving entity or (ii) the
     successor or transferee (the "successor corporation") is a corporation
     organized and existing under the laws of the United States, any state
     thereof or the District of Columbia and shall expressly assume, by an
     indenture supplemental hereto, executed and delivered to the Trustee, all
     of the obligations of the Company or Guarantor under the Securities and
     this Indenture;

                                      -38-

<PAGE>

          (b) if as a result of such transaction the Securities become
     convertible or exchangeable into common stock or other securities issued by
     a third party, such third party fully and unconditionally guarantees all
     obligations under the Securities and this Indenture;

          (c) immediately after giving effect to such transaction, no Default or
     Event of Default shall exist; and

          (d) the Company shall have delivered to the Trustee an Officers'
     Certificate and, if requested by the Trustee, an Opinion of Counsel, each
     stating that such consolidation, merger, conveyance, transfer, sale, lease
     or other disposition and, if a supplemental indenture is required in
     connection with such transaction, such supplemental indenture comply with
     this Article 6 and that all conditions precedent herein provided for
     relating to such transaction have been satisfied.

SECTION 6.2. SUCCESSOR SUBSTITUTED.

     Upon any consolidation of the Company with, or merger of the Company into,
any other Person or any conveyance, transfer or lease of all or substantially
all of the properties and assets of the Company in accordance with Section 6.1,
the successor Person formed by such consolidation or into which the Company is
merged or to which such conveyance, transfer or lease is made shall succeed to,
and be substituted for, and may exercise every right and power of, the Company
under this Indenture with the same effect as if such successor Person had been
named as the Company herein, and thereafter, except in the case of a lease, the
predecessor Person shall be relieved of all obligations and covenants under this
Indenture and the Securities.

SECTION 6.3. GUARANTOR MAY CONSOLIDATE, ETC., ONLY ON CERTAIN TERMS.

     A Guarantor shall not consolidate with or merge into any Person or convey,
transfer or lease its properties and assets substantially as an entity to
another Person unless the surviving Person assumes the obligations of such
Guarantor and the surviving Person is a corporation organized and existing under
the laws of the United States, any state thereof or the District of Columbia,
except if all of the assets or all of the common stock of such Guarantor is sold
to a non-affiliate of the Company, in which case the Guarantee is released.

                                    ARTICLE 7

                              DEFAULT AND REMEDIES

SECTION 7.1. EVENTS OF DEFAULT.

     An "Event of Default" shall occur if:

          (a) the Company defaults in the payment of the principal amount with
     respect to the Securities, when the same becomes due and payable, whether
     at maturity or upon redemption;

          (b) the Company defaults in the payment of any accrued and unpaid
     interest (including Liquidated Damages, if any), in each case, when due and
     payable, and continuance of such default for a period of 30 days;

          (c) the Company fails to satisfy its conversion obligation with
     respect to any portion of the principal amount of any Security following
     the exercise by a Holder of the right to convert such Security into shares
     of Common Stock (or cash or a combination of shares of Common

                                      -39-

<PAGE>

     Stock and cash, if the Company so elects) pursuant to and in accordance
     with Article 4, which is not cured within 15 days;

          (d) the Company defaults in its obligation to pay the Put Right
     Purchase Price or the Fundamental Change Purchase Price, as applicable,
     with respect to any Security, or any portion thereof, upon the exercise by
     a Holder of such Holder's right to require the Company to purchase or
     repurchase such Securities pursuant to and in accordance with Section 3.7
     or 3.8, as applicable;

          (e) the Company or any Guarantor fails to comply with any of its
     agreements or covenants in the Securities or this Indenture (other than
     those referred to in clauses (a) through (d) above) and such failure
     continues for 60 days after receipt by the Company of a Notice of Default;

          (f) the Company fails or any Significant Subsidiary of the Company
     fails to make any payment at maturity on any indebtedness for money
     borrowed, including any applicable grace periods, in an amount in excess of
     $25.0 million in the aggregate for all such indebtedness for money borrowed
     and such amount has not been paid or discharged within 30 days after
     receipt by the Company of a Notice of Default;

          (g) a default by the Company or any Significant Subsidiary of the
     Company that results in the acceleration of maturity of any indebtedness of
     the Company or any Guarantor for money borrowed of the Company or any
     Significant Subsidiary, at any one time, in an amount in excess of $25.0
     million unless the acceleration is cured, waived or rescinded within 30
     days after receipt by the Company of a Notice of Default;

          (h) any Guarantee ceases to be in full force and effect or is declared
     null and void or any Guarantor denies that it has any further liability
     under any Guarantee, or gives notice to such effect (other than by reason
     of the termination of this Indenture or the release of any such Guarantee
     in accordance with this Indenture), and such condition shall have continued
     for a period of 30 days after written notice of such failure requiring the
     Guarantor or the Company to remedy the same shall have been given to the
     Company by the Trustee or to the Company and the Trustee by the Holders of
     25% in the aggregate principal amount at maturity of the Securities
     outstanding;

          (i) the Company, or a Guarantor, pursuant to or under or within the
     meaning of any Bankruptcy Law:

               (1) commences a voluntary case or proceeding;

               (2) consents to the entry of any order for relief against it in
          an involuntary case or proceeding or the commencement of any case
          against it;

               (3) consents to the appointment of a Custodian of it or for any
          substantial part of its property;

               (4) makes a general assignment for the benefit of its creditors;

               (5) files a petition in bankruptcy or answer or consent seeking
          reorganization or relief; or

               (6) consents to the filing of such petition or the appointment of
          or taking possession by a Custodian; or

                                      -40-

<PAGE>

          (j) a court of competent jurisdiction enters an order or decree under
     any Bankruptcy Law that:

               (1) is for relief against the Company, or a Guarantor, in an
          involuntary case or proceeding;

               (2) appoints a Custodian of the Company, or a Guarantor, or for
          any substantial part of its property; or

               (3) orders the winding-up or liquidation of the Company, or a
          Guarantor,

     and in each case the order or decree remains unstayed and in effect for 60
consecutive days.

     The term "Bankruptcy Law" means Title 11 of the United States Code (or any
successor thereto) or any similar federal or state law for the relief of
debtors. The term "Custodian" means any receiver, trustee, assignee, liquidator,
sequestrator or similar official under any Bankruptcy Law.

     A default under clause (e) above is not an Event of Default until the
Trustee notifies the Company, or the Holders of at least 25% in aggregate
principal amount of the Securities then outstanding notify the Company and the
Trustee, in writing, of the default. The notice given pursuant to this Section
7.1 must specify the default, demand that it be remedied and state that the
notice is a "Notice of Default." When any default under this Section 7.1 is
cured, it ceases.

     The Trustee shall not be charged with knowledge of any Event of Default
unless written notice thereof shall have been given to a Trust Officer at the
Corporate Trust Office of the Trustee by the Company, a Paying Agent, any Holder
or any agent of any Holder.

SECTION 7.2. ACCELERATION.

     If an Event of Default (other than an Event of Default specified in clause
(i) or (j) of Section 7.1) occurs and is continuing, the Trustee may, by notice
to the Company, or the Holders of at least 25% in aggregate principal amount of
the Securities then outstanding may, by notice to the Company and the Trustee,
declare all unpaid principal to the date of acceleration on the Securities then
outstanding (if not then due and payable) to be due and payable upon any such
declaration, and the same shall become and be immediately due and payable. If an
Event of Default specified in clause (i) or (j) of Section 7.1 occurs, all
unpaid principal of the Securities then outstanding shall ipso facto become and
be immediately due and payable without any declaration or other act on the part
of the Trustee or any Holder. The Holders of a majority in aggregate principal
amount of the Securities then outstanding by notice to the Trustee may rescind
or annul such acceleration and its consequences if (a) all existing Events of
Default, other than the nonpayment of the principal of the Securities which has
become due solely by such declaration of acceleration, have been cured or
waived; (b) to the extent the payment of such interest is lawful, interest
(calculated at the rate per annum borne by the Securities) on overdue
installments of interest and overdue principal, which has become due otherwise
than by such declaration of acceleration, has been paid; (c) the rescission
would not conflict with any judgment, order or decree of a court of competent
jurisdiction; and (d) all payments due to the Trustee and any predecessor
Trustee under Section 8.7 have been made. No such rescission, unless it
otherwise so specifies, shall affect any subsequent default or impair any right
consequent thereto.

                                      -41-

<PAGE>

SECTION 7.3. OTHER REMEDIES.

     If an Event of Default occurs and is continuing, the Trustee may, but shall
not be obligated to, pursue any available remedy by proceeding at law or in
equity to collect the payment of the principal of or interest on the Securities
or to enforce the performance of any provision of the Securities or this
Indenture.

     The Trustee may maintain a proceeding even if it does not possess any of
the Securities or does not produce any of them in the proceeding. A delay or
omission by the Trustee or any Holder in exercising any right or remedy accruing
upon an Event of Default shall not impair the right or remedy or constitute a
waiver of or acquiescence in the Event of Default. No remedy is exclusive of any
other remedy. All available remedies are cumulative to the extent permitted by
law.

SECTION 7.4. WAIVER OF DEFAULTS AND EVENTS OF DEFAULT.

     Subject to Sections 7.7 and 10.2, the Holders of a majority in aggregate
principal amount of the Securities then outstanding by notice to the Trustee may
waive an existing default or Event of Default and its consequences, except a
default or Event of Default (i) in the payment of the principal of, premium, if
any, or interest (including Liquidated Damages, if any) on any Security, or the
payment of the Redemption Price, the Put Right Purchase Price, or the
Fundamental Change Purchase Price, (ii) arising from the Company's failure to
comply with the conversion procedures provided in Article 4 of this Indenture,
or (iii) in respect of any provision of this Indenture which, under Section
10.2, cannot be modified or amended without the consent of the Holder of each
Security affected. When a default or Event of Default is waived, it is cured and
ceases.

SECTION 7.5. WAIVER OF COMPLIANCE.

     Except as otherwise provided in this Indenture, the Holders of a majority
in aggregate principal amount of the Securities then outstanding, by notice to
the Trustee, may waive compliance with any provision of this Indenture, or of
the Securities (as described in this Indenture).

SECTION 7.6. CONTROL BY MAJORITY.

     The Holders of a majority in aggregate principal amount of the Securities
then outstanding may direct the time, method and place of conducting any
proceeding for any remedy available to the Trustee or exercising any trust or
power conferred on it. However, the Trustee may refuse to follow any direction
that conflicts with law or this Indenture, that the Trustee determines may be
unduly prejudicial to the rights of another Holder or the Trustee, or that may
involve the Trustee in personal liability unless the Trustee is offered
indemnity, reasonably satisfactory to it, against the costs, expenses and
liabilities the Trustee may incur to comply with such request or demand;
provided, however, that the Trustee may take any other action deemed proper by
the Trustee which is not inconsistent with such direction.

SECTION 7.7. LIMITATIONS ON SUITS.

     A Holder may not pursue any remedy with respect to this Indenture or the
Securities (except actions for payment of overdue principal or interest or for
the conversion of the Securities pursuant to Article 4) unless:

          (a) the Holder gives to the Trustee written notice of a continuing
     Event of Default;

                                      -42-

<PAGE>

          (b) the Holders of at least 25% in aggregate principal amount of the
     then outstanding Securities make a written request to the Trustee to pursue
     the remedy;

          (c) the Holder or Holders offer to the Trustee indemnity reasonably
     satisfactory to it against any loss, liability or expense; and

          (d) the Trustee does not comply with the request within 60 days after
     receipt of the request and the offer of indemnity and no direction
     inconsistent with such written request has been given to the Trustee during
     such 60-day period by the Holders of a majority in aggregate principal
     amount of the Securities then outstanding.

     A Holder may not use this Indenture to prejudice the rights of another
Holder or to obtain a preference or priority over such other Holder.

SECTION 7.8. COLLECTION SUIT BY TRUSTEE.

     If an Event of Default in the payment of principal or interest specified in
clause (a) or (b) of Section 7.1 occurs and is continuing, the Trustee may
recover judgment in its own name and as trustee of an express trust against the
Company or another obligor on the Securities for the whole amount of principal
and accrued interest remaining unpaid, together with, to the extent that payment
of such interest is lawful, interest on overdue principal and on overdue
installments of interest, in each case at the rate per annum borne by the
Securities and such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.

SECTION 7.9. TRUSTEE MAY FILE PROOFS OF CLAIM.

     The Trustee may file such proofs of claim and other papers or documents as
may be necessary or advisable in order to have the claims of the Trustee
(including any claim for the reasonable compensation, expenses, disbursements
and advances of the Trustee, its agents and counsel) and the Holders allowed in
any judicial proceedings relative to the Company (or any other obligor on the
Securities), its creditors or its property and shall be entitled and empowered
to collect and receive any money or other property payable or deliverable on any
such claims and to distribute the same, and any Custodian in any such judicial
proceeding is hereby authorized by each Holder to make such payments to the
Trustee and, in the event that the Trustee shall consent to the making of such
payments directly to the Holders, to pay to the Trustee any amount due to it for
the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 8.7, and to the extent that such payment of the reasonable compensation,
expenses, disbursements and advances in any such proceedings shall be denied for
any reason, payment of the same shall be secured by a lien on, and shall be paid
out of, any and all distributions, dividends, money, securities and other
property which the Holders may be entitled to receive in such proceedings,
whether in liquidation or under any plan of reorganization or arrangement or
otherwise. Nothing herein contained shall be deemed to authorize the Trustee to
authorize or consent to, or, on behalf of any Holder, to authorize, accept or
adopt any plan of reorganization, arrangement, adjustment or composition
affecting the Securities or the rights of any Holder thereof, or to authorize
the Trustee to vote in respect of the claim of any Holder in any such
proceeding.

SECTION 7.10. PRIORITIES.

     If the Trustee collects any money pursuant to this Article 7, it shall pay
out the money in the following order:

                                      -43-

<PAGE>

          (a) First, to the Trustee for amounts due under Section 8.7;

          (b) Second, to Holders for amounts due and unpaid on the Securities
     for principal and interest (including Liquidated Damages, if any), ratably,
     without preference or priority of any kind, according to the amounts due
     and payable on the Securities for principal and interest (including
     Liquidated Damages, if any), respectively; and

          (c) Third, the balance, if any, to the Company.

     The Trustee may fix a record date and payment date for any payment to
Holders pursuant to this Section 7.10.

SECTION 7.11. UNDERTAKING FOR COSTS.

     In any suit for the enforcement of any right or remedy under this Indenture
or in any suit against the Trustee for any action taken or omitted by it as
Trustee, a court in its discretion may require the filing by any party litigant
in the suit of an undertaking to pay the costs of the suit, and the court in its
discretion may assess reasonable costs, including reasonable attorneys' fees and
expenses, against any party litigant in the suit, having due regard to the
merits and good faith of the claims or defenses made by the party litigant. This
Section 7.11 does not apply to a suit made by the Trustee, a suit by a Holder
pursuant to Section 7.7, or a suit by Holders of more than 10% in aggregate
principal amount of the Securities then outstanding.

                                   ARTICLE 8

                                     TRUSTEE

SECTION 8.1. DUTIES OF TRUSTEE.

     (a) If an Event of Default has occurred and is continuing, the Trustee
shall exercise such of the rights and powers vested in it by this Indenture and
use the same degree of care and skill in its exercise as a prudent person would
exercise or use under the circumstances in the conduct of his or her own
affairs.

     (b) Except during the continuance of an Event of Default:

          (1) the Trustee need perform only those duties as are specifically set
     forth in this Indenture and no others; and

          (2) in the absence of bad faith on its part, the Trustee may
     conclusively rely, as to the truth of the statements and the correctness of
     the opinions expressed therein, upon certificates or opinions furnished to
     the Trustee and conforming to the requirements of this Indenture. The
     Trustee, however, shall examine any certificates and opinions, which by any
     provision hereof are specifically required to be delivered to the Trustee
     to determine whether or not they conform to the requirements of this
     Indenture.

     (c) The Trustee may not be relieved from liability for its own negligent
action, its own negligent failure to act, or its own willful misconduct, except
that:

          (1) this paragraph does not limit the effect of subsection (b) of this
     Section 8.1;

                                      -44-

<PAGE>

          (2) the Trustee shall not be liable for any error of judgment made in
     good faith by a Trust Officer, unless it is proved that the Trustee was
     negligent in ascertaining the pertinent facts; and

          (3) the Trustee shall not be liable with respect to any action it
     takes or omits to take in good faith in accordance with a direction
     received by it pursuant to Section 7.6.

     (d) No provision of this Indenture shall require the Trustee to expend or
risk its own funds or otherwise incur any financial liability in the performance
of any of its duties hereunder or in the exercise of any of its rights or powers
unless the Trustee shall have received adequate indemnity in its opinion against
potential costs and liabilities incurred by it relating thereto.

     (e) Every provision of this Indenture that in any way relates to the
Trustee is subject to subsections (a), (b), (c) and (d) of Section 8.1.

     (f) The Trustee shall not be liable for interest on any money received by
it except as the Trustee may agree in writing with the Company. Money held in
trust by the Trustee need not be segregated from other funds except to the
extent required by law.

SECTION 8.2. RIGHTS OF TRUSTEE.

     Subject to Section 8.1:

          (a) The Trustee may rely conclusively, and shall be protected in
     acting or refraining from acting, upon any document believed by it to be
     genuine and to have been signed or presented by the proper person. The
     Trustee need not investigate any fact or matter stated in the document.

          (b) Before the Trustee acts or refrains from acting, it may require an
     Officers' Certificate or an Opinion of Counsel, which shall conform to
     Section 12.4(b). The Trustee shall not be liable for any action it takes or
     omits to take in good faith in reliance on such Officers' Certificate or
     Opinion.

          (c) The Trustee may act through its agents and shall not be
     responsible for the misconduct or negligence of any agent appointed with
     due care.

          (d) The Trustee shall not be liable for any action it takes or omits
     to take in good faith which it believes to be authorized or within its
     rights or powers.

          (e) The Trustee may consult with counsel of its selection, and the
     advice or opinion of such counsel as to matters of law shall be full and
     complete authorization and protection in respect of any such action taken,
     omitted or suffered by it hereunder in good faith and in accordance with
     the advice or opinion of such counsel.

          (f) The Trustee shall be under no obligation to exercise any of the
     rights or powers vested in it by this Indenture at the request or direction
     of any of the Holders pursuant to this Indenture, unless such Holders shall
     have offered to the Trustee security or indemnity satisfactory to the
     Trustee against the costs, expenses and liabilities which might be incurred
     by it in compliance with such request or direction.

                                      -45-

<PAGE>

          (g) The Trustee shall not be bound to make any investigation into the
     facts or matters stated in any resolution, certificate, statement,
     instrument, opinion, report, notice, request, direction, consent, order,
     bond, debenture, security, other evidence of indebtedness or other paper or
     document, but the Trustee, in its discretion, may make such further inquiry
     or investigation into such facts or matters as it may see fit, and, if the
     Trustee shall determine to make such further inquiry or investigation, it
     shall be entitled to examine the books, records and premises of the
     Company, personally or by agent or attorney at the sole cost of the Company
     and shall incur no liability or additional liability of any kind by reason
     of such inquiry or investigation. Except with respect to Sections 5.1 and
     5.3, the Trustee shall have no duty to inquire as to the performance of the
     Company's covenants set forth in Sections 3.7, 3.9, 3.10 and 3.11 and in
     Articles 4, 5 and 6.

          (h) The Trustee shall not be deemed to have notice of any Default or
     Event of Default unless a Trust Officer of the Trustee has actual knowledge
     thereof or unless written notice of any event which is in fact such a
     default is received by the Trustee at the Corporate Trust Office, and such
     notice references the Securities and this Indenture.

          (i) The rights, privileges, protections, immunities and benefits given
     to the Trustee, including, without limitation, its right to be indemnified,
     are extended to, and shall be enforceable by, the Trustee in each of its
     capacities hereunder, and to each agent, custodian and other Person
     employed to act hereunder.

          (j) The Trustee shall not be required to give any bond or surety in
     respect of the performance of its powers and duties hereunder.

          (k) The permissive rights of the Trustee to do things enumerated in
     this Indenture shall not be construed as duties.

SECTION 8.3. INDIVIDUAL RIGHTS OF TRUSTEE.

     The Trustee in its individual or any other capacity may become the owner or
pledgee of Securities and may otherwise deal with the Company or an Affiliate of
the Company with the same rights it would have if it were not Trustee. Any Agent
may do the same with like rights. However, the Trustee is subject to Sections
8.10 and 8.11.

SECTION 8.4. TRUSTEE'S DISCLAIMER.

     The Trustee makes no representation as to the validity or adequacy of this
Indenture or the Securities, it shall not be accountable for the Company's use
of the proceeds from the Securities, and it shall not be responsible for any
statement in the Securities other than its certificate of authentication.

SECTION 8.5. NOTICE OF DEFAULT OR EVENTS OF DEFAULT.

     If a default or an Event of Default occurs and is continuing and if the
Trustee has received notice thereof in accordance with this Indenture, the
Trustee shall mail to each Holder notice of the default or Event of Default
within 30 days after it occurs. However, the Trustee may withhold the notice if
and so long as a committee of its Trust Officers in good faith determines that
withholding notice is in the interests of Holders, except in the case of a
default or an Event of Default in payment of the principal of or interest on any
Security.

                                      -46-

<PAGE>

SECTION 8.6. REPORTS BY TRUSTEE TO HOLDERS.

     If such report is required by TIA Section 313, within 60 days after each
March 30, beginning with the March 30 following the date of this Indenture, the
Trustee shall mail to each Holder a brief report dated as of such date that
complies with TIA Section 313(a). The Trustee also shall comply with TIA Section
313(b)(2) and (c).

     A copy of each report at the time of its mailing to Holders shall be mailed
to the Company and filed with the SEC and each stock exchange, if any, on which
the Securities are listed. The Company shall notify the Trustee whenever the
Securities become listed on any stock exchange or listed or admitted to trading
on any quotation system and any changes in the stock exchanges or quotation
systems on which the Securities are listed or admitted to trading and of any
delisting thereof.

SECTION 8.7. COMPENSATION AND INDEMNITY.

     The Company shall pay to the Trustee from time to time such compensation
(as agreed to from time to time by the Company and the Trustee in writing) for
its services (which compensation shall not be limited by any provision of law in
regard to the compensation of a trustee of an express trust). The Company shall
reimburse the Trustee upon request for all reasonable disbursements, expenses
and advances incurred or made by it. Such expenses may include the reasonable
compensation, disbursements and expenses of the Trustee's agents and counsel.

     The Company shall indemnify the Trustee or any predecessor Trustee (which
for purposes of this Section 8.7 shall include its officers, directors,
employees and agents) for, and hold it harmless against, any and all loss,
liability or expense including taxes (other than taxes based upon, measured by
or determined by the income of the Trustee), (including reasonable legal fees
and expenses) incurred by it in connection with the acceptance or administration
of its duties under this Indenture or any action or failure to act as authorized
or within the discretion or rights or powers conferred upon the Trustee
hereunder including the reasonable costs and expenses of the Trustee and its
counsel in defending itself against any claim or liability in connection with
the exercise or performance of any of its powers or duties hereunder. The
Trustee shall notify the Company promptly of any claim asserted against the
Trustee for which it may seek indemnity. The Company need not pay for any
settlement without its written consent, which shall not be unreasonably
withheld.

     The Company need not reimburse the Trustee for any expense or indemnify it
against any loss or liability incurred by it resulting from its gross negligence
or bad faith.

     To secure the Company's payment obligations in this Section 8.7, the
Trustee shall have a senior claim to which the Securities are hereby made
subordinate on all money or property held or collected by the Trustee, except
such money or property held in trust to pay the principal of and interest on the
Securities. The obligations of the Company under this Section 8.7 shall survive
the satisfaction and discharge of this Indenture or the resignation or removal
of the Trustee.

     When the Trustee incurs expenses or renders services after an Event of
Default specified in clause (j) or (k) of Section 7.1 occurs, the expenses and
the compensation for the services are intended to constitute expenses of
administration under any Bankruptcy Law. The provisions of this Section shall
survive the termination of this Indenture.

                                      -47-

<PAGE>

SECTION 8.8. REPLACEMENT OF TRUSTEE.

     The Trustee may resign by so notifying the Company. The Holders of a
majority in aggregate principal amount of the Securities then outstanding may
remove the Trustee by so notifying the Trustee and may, with the Company's
written consent, appoint a successor Trustee. The Company may remove the Trustee
if:

          (a)  the Trustee fails to comply with Section 8.10;

          (b)  the Trustee is adjudged a bankrupt or an insolvent;

          (c)  a receiver or other public officer takes charge of the Trustee or
               its property; or

          (d)  the Trustee becomes incapable of acting.

     If the Trustee resigns or is removed or if a vacancy exists in the office
of Trustee for any reason, the Company shall promptly appoint a successor
Trustee. The resignation or removal of a Trustee shall not be effective until a
successor Trustee shall have delivered the written acceptance of its appointment
as described below.

     If a successor Trustee does not take office within 45 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company or the
Holders of 10% in principal amount of the Securities then outstanding may
petition any court of competent jurisdiction for the appointment of a successor
Trustee at the expense of the Company.

     If the Trustee fails to comply with Section 8.10, any Holder may petition
any court of competent jurisdiction for the removal of the Trustee and the
appointment of a successor Trustee.

     A successor Trustee shall deliver a written acceptance of its appointment
to the retiring Trustee and to the Company. Immediately after that, the retiring
Trustee shall transfer all property held by it as Trustee to the successor
Trustee and be released from its obligations (exclusive of any liabilities that
the retiring Trustee may have incurred while acting as Trustee) hereunder, the
resignation or removal of the retiring Trustee shall become effective, and the
successor Trustee shall have all the rights, powers and duties of the Trustee
under this Indenture. A successor Trustee shall mail notice of its succession to
each Holder.

     A retiring Trustee shall not be liable for the acts or omissions of any
successor Trustee after its succession.

     Notwithstanding replacement of the Trustee pursuant to this Section 8.8,
the Company's obligations under Section 8.7 shall continue for the benefit of
the retiring Trustee.

SECTION 8.9. SUCCESSOR TRUSTEE BY MERGER, ETC.

     If the Trustee consolidates with, merges or converts into, or transfers all
or substantially all of its corporate trust assets (including the administration
of this Indenture) to, another corporation, the resulting, surviving or
transferee corporation, without any further act, shall be the successor Trustee,
provided such transferee corporation shall qualify and be eligible under Section
8.10. Such successor Trustee shall promptly mail notice of its succession to the
Company and each Holder.

                                      -48-

<PAGE>

SECTION 8.10. ELIGIBILITY; DISQUALIFICATION.

     The Trustee shall always satisfy the requirements of paragraphs (1), (2)
and (5) of TIA Section 310(a). The Trustee (or its parent holding company) shall
have a combined capital and surplus of at least $50,000,000. If at any time the
Trustee shall cease to satisfy any such requirements, it shall resign
immediately in the manner and with the effect specified in this Article 9. The
Trustee shall be subject to the provisions of TIA Section 310(b). Nothing herein
shall prevent the Trustee from filing with the SEC the application referred to
in the penultimate paragraph of TIA Section 310(b).

SECTION 8.11. PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

     The Trustee shall comply with TIA Section 311(a), excluding any creditor
relationship listed in TIA Section 311(b). A Trustee who has resigned or been
removed shall be subject to TIA Section 311(a) to the extent indicated therein.

                                    ARTICLE 9

                     SATISFACTION AND DISCHARGE OF INDENTURE

SECTION 9.1. SATISFACTION AND DISCHARGE OF INDENTURE.

     This Indenture shall cease to be of further effect (except as to any
surviving rights of exchange, registration of transfer or conversion of
Securities herein expressly provided for and except as further provided below),
and the Trustee, on demand of and at the expense of the Company, shall execute
proper instruments acknowledging satisfaction and discharge of this Indenture,
when

          (a)  either:

               (1) all Securities theretofore authenticated and delivered (other
          than (i) Securities which have been destroyed, lost or stolen and
          which have been replaced or paid as provided in Section 2.7 and (ii)
          Securities for whose payment money has theretofore been deposited in
          trust and thereafter repaid to the Company as provided in Section 9.3)
          have been delivered to the Trustee for cancellation; or

               (2) all such Securities not theretofore delivered to the Trustee
          for cancellation

                    (i) have become due and payable, or

                    (ii) will become due and payable within one year at the
               Final Maturity Date or at thePut Right Purchase Date or
               Fundamental Change Purchase Date, or

                    (iii) are to be called for redemption under arrangements
               satisfactory to the Trustee for the giving of notice of
               redemption by the Trustee in the name, and at the expense, of the
               Company,

          and the Company, or any Guarantor, in the case of clause (i), (ii) or
          (iii) above, has irrevocably deposited or caused to be irrevocably
          deposited with the Trustee or a Paying Agent (other than the Company
          or any of its Affiliates) as trust funds in trust for the purpose cash
          and/or shares of Common Stock (as permitted under the Indenture) in an

                                      -49-

<PAGE>

          amount sufficient to pay and discharge the entire indebtedness on such
          Securities not theretofore delivered to the Trustee for cancellation,
          for principal and interest (including Liquidated Damages, if any) to
          the date of such deposit (in the case of Securities which have become
          due and payable) or to the Final Maturity Date, Redemption Date, Put
          Right Purchase Date or Fundamental Change Purchase Date, as the case
          may be; provided, however, that there shall not exist, on the date of
          such deposit, a Default or Event of Default; provided, further, that
          such deposit shall not result in a breach or violation of, or
          constitute a default under, this Indenture or any other agreement or
          instrument to which the Company is a party or to which the Company is
          bound;

          (b) the Company or any Guarantor has paid or caused to be paid or
     deposited with the Trustee or the Paying Agent amounts sufficient to pay
     all other sums payable hereunder by the Company; and

          (c) the Company has delivered to the Trustee an Officers' Certificate
     and an Opinion of Counsel, each stating that all conditions precedent
     herein provided for relating to the satisfaction and discharge of this
     Indenture have been complied with.

     Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 8.7 shall survive and,
if money shall have been deposited with the Trustee pursuant to subclause (2) of
clause (a) of this Section, the provisions of Sections 2.3, 2.4, 2.5, 2.6, 2.7,
2.12, 3.7, 3.8, 8.7 and this Article 9 shall survive until the Securities have
been paid in full.

SECTION 9.2. APPLICATION OF TRUST MONEY.

     Subject to the provisions of Section 9.3, the Trustee or a Paying Agent
shall hold in trust, for the benefit of the Holders, all money deposited with it
pursuant to Section 9.1 and shall apply the deposited money in accordance with
this Indenture and the Securities to the payment of the principal of and
interest on the Securities.

SECTION 9.3. REPAYMENT TO COMPANY.

     The Trustee and each Paying Agent shall promptly pay to the Company upon
request any excess money (i) deposited with them pursuant to Section 9.1 and
(ii) held by them at any time.

     The Trustee and each Paying Agent shall pay to the Company upon request any
money held by them for the payment of principal or interest that remains
unclaimed for two years after a right to such money has matured; provided,
however, that the Trustee or such Paying Agent, before being required to make
any such payment, may, at the expense of the Company, either publish in a
newspaper of general circulation in the City of New York, or cause to be mailed
to each Holder entitled to such money, notice that such money remains unclaimed
and that after a date specified therein, which shall be at least 30 days from
the date of such mailing, any unclaimed balance of such money then remaining
will be repaid to the Company. After payment to the Company, Holders entitled to
money must look to the Company for payment as general creditors unless an
applicable abandoned property law designates another person, and the Trustee and
each Paying Agent shall be relieved of all liability with respect to such money.

SECTION 9.4. REINSTATEMENT.

     If the Trustee or any Paying Agent is unable to apply any money in
accordance with Section 9.2 by reason of any legal proceeding or by reason of
any order or judgment of any court or governmental authority enjoining,
restraining or otherwise prohibiting such application, then the Company's
obligations

                                      -50-

<PAGE>

under this Indenture and the Securities shall be revived and reinstated as
though no deposit had occurred pursuant to Section 9.1 until such time as the
Trustee or such Paying Agent is permitted to apply all such money in accordance
with Section 9.2; provided, however, that if the Company has made any payment of
the principal of or interest on any Securities because of the reinstatement of
its obligations, the Company shall be subrogated to the rights of the Holders of
such Securities to receive any such payment from the money held by the Trustee
or such Paying Agent.

                                   ARTICLE 10

                       AMENDMENTS, SUPPLEMENTS AND WAIVERS

SECTION 10.1. WITHOUT CONSENT OF HOLDERS.

     The Company, with the Trustee's consent, may amend or supplement this
Indenture or the Securities without notice to or consent of any Holder to:

          (a) add to the covenants of the Company for the benefit of the Holders
     of Securities;

          (b) surrender any right or power herein conferred upon the Company by
     this Indenture;

          (c) provide for the assumption of the Company's obligations to the
     Holders of Securities in the case of a merger, consolidation, conveyance,
     transfer, sale, lease or other disposition of all or substantially all of
     the Company's property or assets pursuant to Article 6;

          (d) increase the Conversion Rate or make other adjustments to the
     Conversion Rate, in accordance with this Indenture;

          (e) comply with the requirements of the SEC in order to effect or
     maintain the qualification of this Indenture under the TIA;

          (f) secure the Securities;

          (g) supplement any of the provisions of the Indenture to such extent
     as shall be necessary to permit or facilitate the discharge of the
     Securities, provided, that such change or modification does not adversely
     affect the interests of the Holders of the Securities in any material
     respect;

          (h) make any changes or modifications to this Indenture necessary in
     connection with the registration of the Securities under the Securities Act
     as contemplated in the Registration Rights Agreement; provided, however,
     that such action does not adversely affect the interests of the Holders of
     Securities;

          (i) cure any ambiguity or omission, correct or supplement any
     provision herein which may be inconsistent with any other provision herein
     or which is otherwise defective, or to make any other provisions with
     respect to matters or questions arising under this Indenture which the
     Company may deem necessary or desirable and which shall not be inconsistent
     with the provisions of this Indenture; provided, however, that such action
     does not adversely affect the interests of the Holders of Securities;

          (j) issue additional Securities under this Indenture;

                                      -51-

<PAGE>

          (k) conform the provisions of this Indenture to the express terms of
     the offering memorandum of the Company, dated September 27, 2005 (the
     "Offering Memorandum");

          (l) evidence and provide the acceptance of the appointment of a
     successor Trustee under this Indenture; and

          (m) make any change that does not adversely affect the rights of the
     Holders of the Securities in any material respect.

SECTION 10.2. WITH CONSENT OF HOLDERS.

     The Company and the Trustee may amend or supplement this Indenture or the
Securities with the written consent of the Holders of at least a majority in
aggregate principal amount of the Securities then outstanding. The Holders of at
least a majority in aggregate principal amount of the Securities then
outstanding may waive compliance in a particular instance by the Company with
any provision of this Indenture or the Securities without notice to any Holder.
However, notwithstanding the foregoing but subject to Section 10.4, without the
written consent of each Holder affected, an amendment, supplement or waiver,
including a waiver pursuant to Section 7.4, may not:

          (a) change the stated maturity of the principal of, any premium due on
     or interest on (including Liquidated Damages) any Security;

          (b) reduce the principal amount of, Redemption Price, Put Right
     Purchase Price or Fundamental Change Purchase Price or any premium
     (including any Make-Whole Premium) or interest on (including Liquidated
     Damages) on, any Security;

          (c) alter the manner of calculation or rate of accrual of interest
     (including Liquidated Damages) on any Security;

          (d) change the place or currency of payment of principal of, or any
     premium or interest on (including Liquidated Damages), any Security;

          (e) impair the right of any Holder to institute suit for the
     enforcement of any repurchase of, payment on or with respect to, or
     conversion of, any Security on or after the stated maturity of the
     Securities, in the case of redemption, on or after the Redemption Date, or
     in the case of repayment at the option of the Holder, on or after the Put
     Right Purchase Date or Fundamental Change Purchase Date;

          (f) adversely affect the right of Holders to convert Securities other
     than as provided in or under Article 4 of this Indenture in any material
     respect;

          (g) adversely affect the right of Holders to require the Company to
     purchase or repurchase the Securities as provided in Article 3 of this
     Indenture in any material respect;

          (h) reduce the percentage of the aggregate principal amount of the
     outstanding Securities whose Holders must consent to a modification or
     amendment of this Indenture or the Securities;

          (i) reduce the percentage of the aggregate principal amount of the
     outstanding Securities necessary for the waiver of compliance with any
     provision of this Indenture or of the Securities or the waiver of any
     default or Event of Default;

                                      -52-

<PAGE>

          (j) modify any of the provisions of this Section 10.2 or Section 7.4,
     except to increase any such percentage or to provide that certain
     provisions of this Indenture cannot be modified or waived without the
     consent of the Holder of each outstanding Security affected thereby; and

          (k) release any Guarantor from any of its obligations under its
     Guarantee other than in accordance with the terms of this Indenture.

     It shall not be necessary for the consent of the Holders under this Section
10.2 to approve the particular form of any proposed amendment, supplement or
waiver, but it shall be sufficient if such consent approves the substance
thereof.

     After an amendment, supplement or waiver under this Section 10.2 becomes
effective, the Company shall mail to the Holders affected thereby a notice
briefly describing the amendment, supplement or waiver. Any failure of the
Company to mail such notice, or any defect therein, shall not, however, in any
way impair or affect the validity of any such amendment, supplement or waiver.

     To the extent that the Company or any of the Subsidiaries hold any
Securities, such Securities shall be disregarded for purposes of voting in
connection with any notice, waiver, consent or direction requiring the vote or
concurrence of Holders.

SECTION 10.3. COMPLIANCE WITH TRUST INDENTURE ACT.

     Every amendment to or supplement of this Indenture or the Securities shall
comply with the TIA as in effect at the date of such amendment or supplement.

SECTION 10.4. REVOCATION AND EFFECT OF CONSENTS.

     Until an amendment, supplement or waiver becomes effective, a consent to it
by a Holder is a continuing consent by the Holder and every subsequent Holder of
a Security or portion of a Security that evidences the same debt as the
consenting Holder's Security, even if notation of the consent is not made on any
Security. However, any such Holder or subsequent Holder may revoke the consent
as to its Security or portion of a Security if the Trustee receives the notice
of revocation before the date the amendment, supplement or waiver becomes
effective.

     After an amendment, supplement or waiver becomes effective, it shall bind
every Holder, unless it makes a change described in any of clauses (a) through
(k) of Section 10.2. In that case the amendment, supplement or waiver shall bind
each Holder of a Security who has consented to it and every subsequent Holder of
a Security or portion of a Security that evidences the same debt as the
consenting Holder's Security.

SECTION 10.5. NOTATION ON OR EXCHANGE OF SECURITIES.

     If an amendment, supplement or waiver changes the terms of a Security, the
Trustee may require the Holder of the Security to deliver it to the Trustee. The
Trustee may place an appropriate notation on the Security about the changed
terms and return it to the Holder. Alternatively, if the Company or the Trustee
so determines, the Company in exchange for the Security shall issue and the
Trustee shall authenticate a new Security that reflects the changed terms.

                                      -53-

<PAGE>

SECTION 10.6. TRUSTEE TO SIGN AMENDMENTS, ETC.

     The Trustee shall sign any amendment or supplemental indenture authorized
pursuant to this Article 10 if the amendment or supplemental indenture does not
adversely affect the rights, duties, liabilities or immunities of the Trustee.
If it does, the Trustee may, in its sole discretion, but need not sign it. In
signing or refusing to sign such amendment or supplemental indenture, the
Trustee shall be entitled to receive and, subject to Section 8.1, shall be fully
protected in relying upon, an Opinion of Counsel stating that such amendment or
supplemental indenture is authorized or permitted by this Indenture and all
conditions precedent to its effectiveness hae been satisfied. The Company may
not sign an amendment or supplement indenture until the Board of Directors
approves it, provided that the Board of Directors need not approve any
particular form thereof.

SECTION 10.7. EFFECT OF SUPPLEMENTAL INDENTURES.

     Upon the execution of any supplemental indenture under this Article, this
Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

                                   ARTICLE 11

                                   GUARANTEES

SECTION 11.1. GUARANTEES.

     The Guarantors jointly and severally, hereby absolutely, unconditionally
and irrevocably guarantee the Securities and obligations of the Company
hereunder and thereunder, and guarantee to each Holder of a Security
authenticated and delivered by the Trustee in accordance with the terms hereof,
and to the Trustee on behalf of such Holder, that: (a) the principal of and cash
interest on the Securities will be paid in full when due, whether at Stated
Maturity of such Security, by acceleration, redemption or otherwise (including,
without limitation, the amount that would become due but for the operation of
the automatic stay under Section 362(a) of the Bankruptcy Law), together with
cash interest and interest on any overdue interest, to the extent lawful, and
all other obligations of the Company to the Holders or the Trustee hereunder or
thereunder will be paid in full or performed, all in accordance with the terms
hereof and thereof; and (b) in case of any extension of time of payment or
renewal of any Securities or of any such other obligations, the same shall be
paid in full when due or performed in accordance with the terms of the extension
or renewal, whether at Stated Maturity, by acceleration redemption or otherwise.

     The Guarantors hereby agree that their obligations hereunder shall be
unconditional, irrespective of the validity, regularity or enforceability of the
Securities or this Indenture, the absence of any action to enforce the same, any
waiver or consent by any Holder with respect to any provisions hereof or
thereof, the recovery of any judgment against the Company, any action to enforce
the same or any other circumstance which might otherwise constitute a legal or
equitable discharge or defense of a Guarantor.

     The Guarantors hereby waive (to the extent permitted by law) the benefits
of diligence, presentment, demand for payment, filing of claims with a court in
the event of insolvency or bankruptcy of the Company, any right to require a
proceeding first against the Company or any other Person, protest, notice and
all demands whatsoever and covenants that the Guarantee of such Guarantor shall
not be discharged as to any Security except by complete performance of the
obligations contained in such Security, this Indenture and such Guarantee. The
Guarantors acknowledge that the Guarantees are a guarantee of payment and not of
collection.

                                      -54-

<PAGE>

     The Guarantors hereby agree that, in the event of a default in payment of
principal or cash interest on such Security, whether at its Stated Maturity, by
acceleration, redemption, purchase or otherwise, legal proceedings may be
instituted by the Trustee on behalf of, or by, the Holder of such Security,
subject to the terms and conditions set forth in this Indenture, directly
against each of the Guarantors to enforce such Guarantor's Guarantee without
first proceeding against the Company or any other Guarantor. The Guarantor
agrees that if, after the occurrence and during the continuance of an Event of
Default, the Trustee or any of the Holders are prevented by applicable law from
exercising their respective rights to accelerate the maturity of the Securities,
to collect interest on the Securities, or to enforce or exercise any other right
or remedy with respect to the Securities, such Guarantor shall pay to the
Trustee for the account of the Holder, upon demand therefor, the amount that
would otherwise have been due and payable had such rights and remedies been
permitted to be exercised by the Trustee or any of the Holders.

     If any Holder or the Trustee is required by any court or otherwise to
return to the Company or any Guarantor, or any custodian, trustee, liquidator or
other similar official acting in relation to either the Company or any
Guarantor, any amount paid by any of them to the Trustee or such Holder, the
Guarantee of each of the Guarantors, to the extent theretofore discharged, shall
be reinstated in full force and effect. The Guarantor further agrees that as
between each Guarantor, on the one hand, and the Holders and the Trustee, on the
other hand, (x) subject to this Article 11, the maturity of the obligations
guaranteed hereby may be accelerated as provided in Article 7 hereof for the
purposes of the Guarantee of such Guarantor notwithstanding any stay, injunction
or other prohibition preventing such acceleration in respect of the obligations
guaranteed hereby, and (y) in the event of any acceleration of such obligation
as provided in Article 7 hereof, such obligations (whether or not due and
payable) shall forthwith become due and payable by each Guarantor for the
purpose of the Guarantee of such Guarantor.

     Each Guarantee shall remain in full force and effect and continue to be
effective should any petition be filed by or against the Company for
liquidation, reorganization, should the Company become insolvent or make an
assignment for the benefit of creditors or should a receiver or trustee be
appointed for all or any significant part of the Company's assets, and shall, to
the fullest extent permitted by law, continue to be effective or be reinstated,
as the case may be, if at any time payment and performance of the Securities
are, pursuant to applicable law, rescinded or reduced in amount, or must
otherwise be restored or returned by any obligee on the Securities, whether as a
"voidable preference," "fraudulent transfer" or otherwise, all as though such
payment or performance had not been made, provided that a Guarantee may be
released as otherwise provided in this Indenture. In the event that any payment
or any part thereof, is rescinded, reduced, restored or returned, for the
purposes of the amounts due under the Guarantees, the Securities shall, to the
fullest extent permitted by law, be reinstated and deemed reduced only by such
amount paid and not so rescinded, reduced, restored or returned. The form of
Guarantee is attached hereto as Exhibit D.

SECTION 11.2. SEVERABILITY.

     In case any provision of any Guarantee shall be invalid, illegal or
unenforceable, the validity, legality, and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

SECTION 11.3. PRIORITY OF GUARANTEES.

     The Guarantee issued by any Guarantor shall be unsecured senior obligations
of such Guarantor, ranking pari passu with all other existing and future senior
unsecured indebtedness of such Guarantor, if any.

                                      -55-

<PAGE>

SECTION 11.4. LIMITATION OF GUARANTORS' LIABILITY.

     Each Guarantor and by its acceptance hereof each Holder confirms that it is
the intention of all such parties that the guarantee by the Guarantor pursuant
to its Guarantee not constitute a fraudulent transfer or conveyance for purposes
of the Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the Uniform
Fraudulent Transfer Act or any similar federal or state law or the provisions of
its local law relating to fraudulent transfer or conveyance. To effectuate the
foregoing intention, the Holders and the Guarantors hereby irrevocably agree
that the obligations of such Guarantor under its Guarantee shall be limited to
the maximum amount that will not, after giving effect to all other contingent
and fixed liabilities of such Guarantor result in the obligations of such
Guarantor under its Guarantee constituting such fraudulent transfer or
conveyance.

SECTION 11.5. SUBROGATION.

     Each Guarantor shall be subrogated to all rights of Holders against the
Company in respect of any amounts paid by any Guarantor pursuant to the
provisions of Section 11.1; provided, however, that, if an Event of Default has
occurred and is continuing, no Guarantor shall be entitled to enforce or receive
any payments arising out of, or based upon, such right of subrogation until all
amounts then due and payable by the Company under this Indenture or the
Securities shall have been paid in full.

SECTION 11.6. REINSTATEMENT.

     The Guarantor hereby agrees (and each Person who becomes a Guarantor shall
agree) that the Guarantee provided for in Section 11.1 shall continue to be
effective or be reinstated, as the case may be, (a) if at any time, payment, or
any part thereof, of any obligations or interest thereon is rescinded or must
otherwise be restored by a Holder to the Company upon the bankruptcy or
insolvency of the Company or any Guarantor and (b) at any time any Guarantor
(and each Person who becomes a Guarantor) guarantees any indebtedness or
obligations of the Company.

SECTION 11.7. RELEASE OF THE GUARANTOR.

     Concurrently with the discharge of the Securities under Section 9.1, each
Guarantor shall be released from all its obligations under its Guarantee under
this Article 11.

     So long as no Default exists or with notice or lapse of time or both, would
exist, the Guarantee issued by any Guarantor shall be automatically and
unconditionally released and discharged upon (a) any sale, exchange or transfer
to any Person that is not an Affiliate of the Company of all of the Capital
Stock of such Guarantor owned by the Company, which transaction is otherwise in
compliance with the Indenture or (b) any release or discharge of all guarantees
by such Guarantor of any indebtedness or obligations of the Company other than
the Guarantees of the Securities.

SECTION 11.8. BENEFITS ACKNOWLEDGED.

     Each Guarantor acknowledges that it will receive direct and indirect
benefits from the financing arrangements contemplated by this Indenture and that
its guarantee and waivers pursuant to its Guarantee are knowingly made in
contemplation of such benefits.

                                      -56-

<PAGE>

                                   ARTICLE 12

                                  MISCELLANEOUS

SECTION 12.1. TRUST INDENTURE ACT CONTROLS.

     If any provision of this Indenture limits, qualifies or conflicts with the
duties imposed by any of Sections 310 to 317, inclusive, of the TIA through
operation of Section 318(c) thereof, such imposed duties shall control.

SECTION 12.2. NOTICES.

     Any demand, authorization notice, request, consent or communication shall
be given in writing and delivered in person or mailed by first-class mail,
postage prepaid, addressed as follows or transmitted by facsimile transmission
(confirmed by delivery in person or mail by first-class mail, postage prepaid,
or by guaranteed overnight courier) to the following facsimile numbers:

     If to the Company, to:

          US Airways Group, Inc.
          2345 Crystal Drive
          Arlington, Virginia 22227
          Attn: Elizabeth K. Lainer, Esq.
          Telephone: (703) 872-7000

     with a copy (for informational purposes only) to:

          Skadden, Arps, Slate, Meagher & Flom LLP
          333 West Wacker Drive
          Chicago, Illinois 60606
          Attn: Peter C. Krupp, Esq.
          Telephone: (312) 407-0700

     if to the Trustee, to:

          U.S. Bank National Association
          60 Livingston Avenue
          St. Paul, Minnesota 55107-2292
          Attention: Corporate Trust Services
          Internal mail EP-MN-WS3C
          US Airways Group, Inc.
          7% Senior Convertible Notes due 2020)
          Facsimile No.: (651) 495-8097

     Such notices or communications shall be effective when received.

     The Company or the Trustee by notice to the other may designate additional
or different addresses for subsequent notices or communications.

     Any notice or communication mailed to a Holder shall be mailed by
first-class mail or delivered by an overnight delivery service to it at its
address shown on the register kept by the Primary Registrar.

                                      -57-

<PAGE>

     Failure to mail a notice or communication to a Holder or any defect in it
shall not affect its sufficiency with respect to other Holders. If a notice or
communication to a Holder is mailed in the manner provided above, it is duly
given, whether or not the addressee receives it.

SECTION 12.3. COMMUNICATIONS BY HOLDERS WITH OTHER HOLDERS.

     Holders may communicate pursuant to TIA Section 312(b) with other Holders
with respect to their rights under this Indenture or the Securities. The
Company, the Trustee, the Registrar and any other Person shall have the
protection of TIA Section 312(c).

SECTION 12.4. CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT.

     (a) Upon any request or application by the Company to the Trustee to take
any action under this Indenture, the Company shall furnish to the Trustee at the
request of the Trustee:

          (1) an Officers' Certificate stating that, in the opinion of the
     signers, all conditions precedent (including any covenants, compliance with
     which constitutes a condition precedent), if any, provided for in this
     Indenture relating to the proposed action have been complied with; and

          (2) an Opinion of Counsel stating that, in the opinion of such
     counsel, all such conditions precedent (including any covenants, compliance
     with which constitutes a condition precedent) have been complied with.

     (b) Each Officers' Certificate and Opinion of Counsel with respect to
compliance with a condition or covenant provided for in this Indenture shall
include:

          (1) a statement that the person making such certificate or opinion has
     read such covenant or condition;

          (2) a brief statement as to the nature and scope of the examination or
     investigation upon which the statements or opinions contained in such
     certificate or opinion are based;

          (3) a statement that, in the opinion of such person, he or she has
     made such examination or investigation as is necessary to enable him or her
     to express an informed opinion as to whether or not such covenant or
     condition has been complied with; and

          (4) a statement as to whether or not, in the opinion of such person,
     such condition or covenant has been complied with;

provided, however, that with respect to matters of fact an Opinion of Counsel
may rely on an Officers' Certificate or certificates of public officials.

SECTION 12.5. RECORD DATE FOR VOTE OR CONSENT OF HOLDERS.

     The Company (or, in the event deposits have been made pursuant to Section
9.1, the Trustee) may set a record date for purposes of determining the identity
of Holders entitled to vote or consent to any action by vote or consent
authorized or permitted under this Indenture, which record date shall not be
more than 30 days prior to the date of the commencement of solicitation of such
action. Notwithstanding the provisions of Section 10.4, if a record date is
fixed, those persons who were Holders of Securities at the close of business on
such record date (or their duly designated proxies), and only those persons,
shall

                                      -58-

<PAGE>

be entitled to take such action by vote or consent or to revoke any vote or
consent previously given, whether or not such persons continue to be Holders
after such record date.

SECTION 12.6. RULES BY TRUSTEE, PAYING AGENT, REGISTRAR AND CONVERSION AGENT.

     The Trustee may make reasonable rules (not inconsistent with the terms of
this Indenture) for action by or at a meeting of Holders. Any Registrar, Paying
Agent or Conversion Agent may make reasonable rules for its functions.

SECTION 12.7. LEGAL HOLIDAYS.

     A "Legal Holiday" is a Saturday, Sunday or a day on which state or
federally chartered banking institutions in New York, New York and the state in
which the Corporate Trust Office is located are not required to be open. If a
payment date is a Legal Holiday, payment shall be made on the next succeeding
day that is not a Legal Holiday, and no interest shall accrue for the
intervening period. If a Regular Record Date is a Legal Holiday, the record date
shall not be affected.

SECTION 12.8. GOVERNING LAW.

     This Indenture, the Securities and the Guarantees shall be governed by, and
construed in accordance with, the laws of the State of New York, without regard
to principles of conflicts of laws.

SECTION 12.9. NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS.

     This Indenture may not be used to interpret another indenture, loan or debt
agreement of the Company or a Subsidiary of the Company. Any such indenture,
loan or debt agreement may not be used to interpret this Indenture.

SECTION 12.10. NO RECOURSE AGAINST OTHERS.

     All liability described in paragraph 17 of the Securities of any director,
officer, employee or shareholder, as such, of the Company is waived and
released.

SECTION 12.11. SUCCESSORS.

     All agreements of the Company in this Indenture and the Securities shall
bind its successor. All agreements of the Trustee in this Indenture shall bind
its successor.

SECTION 12.12. MULTIPLE COUNTERPARTS.

     The parties may sign multiple counterparts of this Indenture. Each signed
counterpart shall be deemed an original, but all of them together represent the
same agreement.

SECTION 12.13. SEPARABILITY.

     In case any provisions in this Indenture or in the Securities shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

                                      -59-

<PAGE>

SECTION 12.14. TABLE OF CONTENTS, HEADINGS, ETC.

     The table of contents, cross-reference sheet and headings of the Articles
and Sections of this Indenture have been inserted for convenience of reference
only, are not to be considered a part hereof, and shall in no way modify or
restrict any of the terms or provisions hereof.

                            [SIGNATURE PAGE FOLLOWS]

                                      -60-

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have hereunto set their hands as of
the date and year first above written.

                                        US AIRWAYS GROUP, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        US AIRWAYS, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        AMERICA WEST AIRLINES, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        U.S. BANK NATIONAL ASSOCIATION,
                                        AS TRUSTEE

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

<PAGE>

                                    EXHIBIT A

                           [FORM OF FACE OF SECURITY]

     UNLESS (1) THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITORY TRUST COMPANY TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF
TRANSFER, EXCHANGE OR PAYMENT, AND (2) ANY CERTIFICATE ISSUED IS REGISTERED IN
THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (AND ANY PAYMENT HEREON IS MADE
TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY), ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. THIS SECURITY IS A
GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND
IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE THEREOF. THIS SECURITY IS
EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE
DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE
INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR
SECURITIES IN DEFINITIVE FORM, THIS SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A
WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE
DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE
DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH
SUCCESSOR DEPOSITARY.(1)

     THIS SECURITY AND THE SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF
THIS SECURITY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS. NEITHER THIS
SECURITY, THE SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THIS SECURITY
NOR ANY INTEREST OR PARTICIPATION HEREIN OR THEREIN MAY BE REOFFERED, SOLD,
ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE
ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT
SUBJECT TO, REGISTRATION. EACH PURCHASER OF THIS SECURITY IS HEREBY NOTIFIED
THAT THE SELLER OF THIS SECURITY MAY BE RELYING ON THE EXEMPTION FROM THE
PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A
THEREUNDER.(2)

     THE HOLDER OF THIS SECURITY, BY ITS ACCEPTANCE HEREOF, AGREES TO OFFER,
SELL OR OTHERWISE TRANSFER SUCH SECURITY, PRIOR TO THE DATE (THE "RESALE
RESTRICTION TERMINATION DATE") WHICH IS TWO YEARS AFTER THE LATER OF THE
ORIGINAL ISSUE DATE HEREOF AND THE LAST DATE ON WHICH US AIRWAYS GROUP, INC. OR
ANY AFFILIATE OF US AIRWAYS GROUP, INC. WAS THE OWNER OF THIS SECURITY (OR ANY
PREDECESSOR OF SUCH SECURITY) ONLY (A) TO US AIRWAYS

----------
(1)  This paragraph should be included only if the Security is a Global
     Security.

(2)  These paragraphs to be included only if the Security is a Restricted
     Security.

                                       A-1

<PAGE>

GROUP, INC. OR ANY PARENT OR SUBSIDIARY THEREOF, (B) FOR SO LONG AS THE
SECURITIES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A, TO A PERSON IT
REASONABLY BELIEVES IS A "QUALIFIED INSTITUTIONAL BUYER" AS DEFINED IN RULE 144A
UNDER THE SECURITIES ACT THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT
OF A QUALIFIED INSTITUTIONAL BUYER TO WHICH NOTICE IS GIVEN THAT THE TRANSFER IS
BEING MADE IN RELIANCE ON RULE 144A, (C) PURSUANT TO A REGISTRATION STATEMENT
WHICH IS EFFECTIVE UNDER THE SECURITIES ACT AT THE TIME OF SUCH OFFER, TRANSFER
OR SALE, OR (D) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO US AIRWAYS GROUP, INC.'S AND THE
TRUSTEE'S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER PURSUANT TO CLAUSE (D)
TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER
INFORMATION SATISFACTORY TO EACH OF THEM, AND IN EACH OF THE FOREGOING CASES, A
CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THE OTHER SIDE OF THIS SECURITY
IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE TRUSTEE. THIS LEGEND WILL BE
REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION
DATE.

     THE HOLDER OF THIS SECURITY IS ENTITLED TO THE BENEFITS OF A REGISTRATION
RIGHTS AGREEMENT (AS SUCH TERM IS DEFINED IN THE INDENTURE REFERRED TO ON THE
REVERSE HEREOF) AND, BY ITS ACCEPTANCE HEREOF, AGREES TO BE BOUND BY AND TO
COMPLY WITH THE PROVISIONS OF SUCH REGISTRATION RIGHTS AGREEMENT.(2)

                                       A-2

<PAGE>

                             US AIRWAYS GROUP, INC.
                      7% Senior Convertible Notes due 2020

No. A1                                                  CUSIP: [_______________]

          US Airways Group, Inc., a Delaware corporation, promises to pay to
Cede & Co. or registered assigns the principal amount of [____________] Dollars
($[__________]) on [______________], 2020.

          This Security shall bear interest as specified on the other side of
this Security. This Security is convertible as specified on the other side of
this Security.

          Additional provisions of this Security are set forth on the other side
of this Security.

Dated: [______________], 2005

                             SIGNATURE PAGE FOLLOWS

                                       A-3

<PAGE>

          IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                                        US AIRWAYS GROUP, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

Dated:
       ------------------------------
Trustee's Certificate of Authentication:
This is one of the Securities referred
to in the within-mentioned Indenture.

U.S. BANK NATIONAL ASSOCIATION,
as Trustee

By:
    ------------------------------------
            Authorized Signatory

                                       A-4

<PAGE>

                       [FORM OF REVERSE SIDE OF SECURITY]

                             US AIRWAYS GROUP, INC.
                      7% Senior Convertible Notes Due 2020

1. INTEREST

     US Airways Group, Inc., a Delaware corporation (the "Company," which term
shall include any successor corporation under the Indenture hereinafter referred
to), promises to pay interest on the principal amount of this Security at the
rate of 7% per annum. The Company shall pay interest semiannually on March 30
and September 30 of each year (each an "Interest Payment Date"), commencing
March 30, 2006. Interest shall accrue on the Securities from the most recent
Interest Payment Date to which interest has been paid, or if no interest has
been paid, from September 30, 2005. Each payment of interest will include
interest accrued through the day before the relevant Interest Payment Date (or
purchase or redemption date, as the case may be). Cash interest will be computed
on the basis of a 360-day year comprised of twelve 30-day months. Any reference
herein to interest accrued or payable as of any date shall include any
Liquidated Damages accrued or payable on such date as provided in the
Registration Rights Agreement.

     No sinking fund is provided for the Securities.

2. METHOD OF PAYMENT

     The Company shall pay interest on this Security (except defaulted interest)
to the person who is the Holder of this Security at the close of business on
March 15 or September 15, as the case may be, (each, a "Regular Record Date")
next preceding the related Interest Payment Date. The Holder must surrender this
Security to a Paying Agent to collect payment of principal. The Company will pay
principal and interest in money of the United States that at the time of payment
is legal tender for payment of public and private debts. The Company may pay
principal and interest in respect of any Certificated Security by check or wire
payable in such money; provided, however, that a Holder with an aggregate
principal amount in excess of $5,000,000 will be paid by wire transfer in
immediately available funds at the election of such Holder if such Holder has
provided wire transfer instructions to the Trustee at least 10 Business Days
prior to the Payment Date. The Company may mail an interest check to the
Holder's registered address. Notwithstanding the foregoing, so long as this
Security is registered in the name of a Depositary or its nominee, all payments
hereon shall be made by wire transfer of immediately available funds to the
account of the Depositary or its nominee.

     Any wire transfer instructions received by the Trustee will remain in
effect until revoked by the Holder.

3. PAYING AGENT, REGISTRAR AND CONVERSION AGENT

     Initially, U.S. Bank National Association (the "Trustee," which term shall
include any successor trustee under the Indenture hereinafter referred to) will
act as Paying Agent, Registrar and Conversion Agent. The Company may change any
Paying Agent, Registrar or Conversion Agent without notice to the Holder. The
Company or any of its Subsidiaries may, subject to certain limitations set forth
in the Indenture, act as Paying Agent or Registrar.

                                       A-5

<PAGE>

4. INDENTURE, LIMITATIONS

     This Security is one of a duly authorized issue of Securities of the
Company designated as its 7% Senior Convertible Notes Due 2020 (the
"Securities"), issued under an Indenture dated as of September 30, 2005
(together with any supplemental indentures thereto, the "Indenture"), among the
Company, the Guarantors and the Trustee. The terms of this Security include
those stated in the Indenture and those required by or made part of the
Indenture by reference to the Trust Indenture Act of 1939, as amended, as in
effect on the date of the Indenture. This Security is subject to all such terms,
and the Holder of this Security is referred to the Indenture and said Act for a
statement of them.

5. REDEMPTION AT THE OPTION OF THE COMPANY

     Prior to October 5, 2010, the Securities shall not be redeemable. On or
after October 5, 2010, the Company may, at its option, redeem the Securities for
cash, as a whole at any time or from time to time in part at a Redemption Price
of 100% of the principal amount of the Securities plus accrued and unpaid cash
interest, if any, and Liquidated Damages, if any, up to but not including the
applicable Redemption Date (the "Redemption Price") if the closing price of the
Company's Common Stock has exceeded 115% of the conversion price for at least 20
trading days in the 30 consecutive trading day period ending on the trading day
before the date on which the company mails the optional redemption notice;
provided that if the Redemption Date falls after a Regular Record Date and on or
before the related Interest Payment Date, then interest on the Securities
payable on such Interest Payment Date will instead be payable to the Holders in
whose names the Securities are registered at the close of business on such
Regular Record Date. Securities or portions of Securities called for redemption
shall be convertible by the Holder until the close of business on the Business
Day prior to the relevant Redemption Date.

6. NOTICE OF REDEMPTION

     Notice of redemption, as set forth in Section 3.3 of the Indenture, will be
mailed by at least 30 days but not more than 60 days before a Redemption Date to
each Holder of Securities to be redeemed at its registered address. Securities
in denominations of $1,000 may only be redeemed in whole. The Trustee may select
for redemption portions (equal to $1,000 or any integral multiple thereof) of
the principal of Securities that have denominations larger than $1,000. On and
after the Redemption Date, subject to the deposit with the Paying Agent of funds
sufficient to pay the Redemption Price, such Securities or portions of them
called for redemption will cease to be outstanding, whether or not the Security
is delivered to the Paying Agent, and the rights of the Holder in respect
thereof shall cease (other than the right to receive the Redemption Price).

7. PURCHASE OF SECURITIES AT OPTION OF HOLDER UPON A FUNDAMENTAL CHANGE

     At the option of the Holder and subject to the terms and conditions of the
Indenture, the Company shall become obligated to purchase for cash, shares of
Common Stock or a combination thereof, subject to certain exceptions described
in the Indenture, all or any part specified by the Holder (so long as the
principal amount of such part is $1,000 or an integral multiple of $1,000) of
the Securities held by such Holder on a date specified by the Company that is no
earlier than 15 days and no later than 30 days after the date that a Fundamental
Change Company Notice is delivered, at a purchase price equal to 100% of the
principal amount thereof together with accrued and unpaid interest, if any, and
accrued and unpaid

                                       A-6

<PAGE>

Liquidated Damages, if any, to, but excluding, the Fundamental Change Purchase
Date. The Holder shall have the right to withdraw any Fundamental Change
Repurchase Notice (in whole or in a portion thereof that is $1,000 or an
integral multiple of $1,000) at any time prior to the close of business on the
fifth Business Day immediately preceding the Fundamental Change Repurchase Date
by delivering a written notice of withdrawal to the Paying Agent in accordance
with the terms of the Indenture.

8. PURCHASE OF SECURITIES AT OPTION OF HOLDER ON SPECIFIED DATES

     At the option of the Holder and subject to the terms and conditions of the
Indenture, the Company shall become obligated to purchase for cash shares or a
combination thereof all or any part specified by the Holder (so long as the
principal amount of such part is $1,000 or an integral multiple of $1,000) of
the Securities held by such Holder on the applicable Put Right Purchase Date at
the applicable Put Right Purchase Price. The Holder shall have the right to
withdraw any Put Right Purchase Notice (in whole or in a portion thereof that is
$1,000 or an integral multiple of $1,000) at any time prior to the close of
business on the second Business Day immediately preceding the Put Right Purchase
Date by delivering a written notice of withdrawal to the Paying Agent in
accordance with the terms of the Indenture.

9. CONVERSION

     Subject to and upon compliance with the provisions of the Indenture and
upon the occurrence of the events specified in the Indenture, a Holder may
surrender for conversion any Security that is $1,000 principal amount or
integral multiples thereof. The Company may elect to pay Holders surrendering
Securities an amount in cash per Security, or a combination of cash and Common
Stock, as specified in the Indenture.

10. DENOMINATIONS, TRANSFER, EXCHANGE

     The Securities are in registered form, without coupons, in denominations of
$1,000 principal amount and integral multiples of $1,000 principal amount. A
Holder may register the transfer of or exchange Securities in accordance with
the Indenture. The Registrar may require a Holder, among other things, to
furnish appropriate endorsements and transfer documents and to pay any taxes or
other governmental charges that may be imposed in relation thereto by law or
permitted by the Indenture.

11. PERSONS DEEMED OWNERS

     The Holder of a Security may be treated as the owner of it for all
purposes.

12. UNCLAIMED MONEY

     If money for the payment of principal or interest remains unclaimed for two
years, the Trustee and any Paying Agent will pay the money back to the Company
at its written request, subject to applicable law and the provisions of the
Indenture. After that, Holders entitled to money must look to the Company for
payment as general creditors, subject to applicable law, and all liability of
the Trustee and the Paying Agent with respect to the money will cease.

                                       A-7

<PAGE>

13. AMENDMENT, SUPPLEMENT AND WAIVER

     Subject to certain exceptions, the Indenture or the Securities may be
amended or supplemented with the consent of the Holders of at least a majority
in aggregate principal amount of the Securities then outstanding, and an
existing Default or Event of Default and its consequence or compliance with any
provision of the Indenture or the Securities may be waived in a particular
instance with the consent of the Holders of a majority in aggregate principal
amount of the Securities then outstanding. Without the consent of or notice to
any Holder, the Company and the Trustee may amend or supplement the Indenture or
the Securities to, among other things, cure any ambiguity, defect or
inconsistency or make any other change that does not adversely affect the rights
of the Holders in any material respect.

14. SUCCESSOR ENTITY

     When a successor corporation assumes all the obligations of its predecessor
under the Securities and the Indenture in accordance with the terms and
conditions of the Indenture, the predecessor corporation (except in certain
circumstances specified in the Indenture) shall be released from those
obligations.

15. DEFAULTS AND REMEDIES

     Under the Indenture, an "Event of Default" shall occur if:

          (a) the Company defaults in the payment of the principal amount with
     respect to the Securities, when the same becomes due and payable, whether
     at maturity or upon redemption;

          (b) the Company defaults in the payment of any accrued and unpaid
     interest (including Liquidated Damages, if any), in each case, when due and
     payable, and continuance of such default for a period of 30 days;

          (c) the Company fails to satisfy its conversion obligation with
     respect to any portion of the principal amount of any Security following
     the exercise by a Holder of the right to convert such Security into shares
     of Common Stock (or cash or a combination of shares of Common Stock and
     cash, if the Company so elects) pursuant to and in accordance with the
     Indenture, which is not cured within 15 days;

          (d) the Company defaults in its obligation to pay the Put Right
     Purchase Price or the Fundamental Change Purchase Price, as applicable,
     with respect to any Security, or any portion thereof, upon the exercise by
     a Holder of such Holder's right to require the Company to purchase or
     repurchase such Securities pursuant to and in accordance with the
     Indenture;

          (e) the Company or any Guarantor fails to comply with any of its
     agreements or covenants in the Securities or this Indenture (other than
     those referred to in clauses (a) through (d) above) and such failure
     continues for 60 days after receipt by the Company of a Notice of Default;

          (f) the Company fails or any Significant Subsidiary of the Company
     fails to make any payment at maturity on any indebtedness for money
     borrowed, including any applicable grace periods, in an amount in excess of
     $25.0 million in the aggregate for all such indebtedness

                                       A-8

<PAGE>

     for money borrowed and such amount has not been paid or discharged within
     30 days after receipt by the Company of a Notice of Default;

          (g) a default by the Company or any Significant Subsidiary of the
     Company that results in the acceleration of maturity of any indebtedness of
     the Company or any Guarantor for money borrowed of the Company or any
     Significant Subsidiary, at any one time, in an amount in excess of $25.0
     million unless the acceleration is cured, waived or rescinded within 30
     days after receipt by the Company of a Notice of Default;

          (h) any Guarantee ceases to be in full force and effect or is declared
     null and void or any Guarantor denies that it has any further liability
     under any Guarantee, or gives notice to such effect (other than by reason
     of the termination of this Indenture or the release of any such Guarantee
     in accordance with this Indenture), and such condition shall have continued
     for a period of 30 days after written notice of such failure requiring the
     Guarantor or the Company to remedy the same shall have been given to the
     Company by the Trustee or to the Company and the Trustee by the Holders of
     25% in the aggregate principal amount at maturity of the Securities
     outstanding;

          (i) the Company, or a Guarantor, pursuant to or under or within the
     meaning of any Bankruptcy Law:

               (1) commences a voluntary case or proceeding;

               (2) consents to the entry of any order for relief against it in
          an involuntary case or proceeding or the commencement of any case
          against it;

               (3) consents to the appointment of a Custodian of it or for any
          substantial part of its property;

               (4) makes a general assignment for the benefit of its creditors;

               (5) files a petition in bankruptcy or answer or consent seeking
          reorganization or relief; or

               (6) consents to the filing of such petition or the appointment of
          or taking possession by a Custodian; or

          (j) a court of competent jurisdiction enters an order or decree under
     any Bankruptcy Law that:

               (1) is for relief against the Company, or a Guarantor, in an
          involuntary case or proceeding;

               (2) appoints a Custodian of the Company, or a Guarantor, or for
          any substantial part of its property; or

               (3) orders the winding-up or liquidation of the Company, or a
          Guarantor,

     and in each case the order or decree remains unstayed and in effect for 60
     consecutive days.

                                       A-9

<PAGE>

     The term "Bankruptcy Law" means Title 11 of the United States Code (or any
successor thereto) or any similar federal or state law for the relief of
debtors. The term "Custodian" means any receiver, trustee, assignee, liquidator,
sequestrator or similar official under any Bankruptcy Law.

     A default under clause (e) above is not an Event of Default until the
Trustee notifies the Company, or the Holders of at least 25% in aggregate
principal amount of the Securities then outstanding notify the Company and the
Trustee, in writing of the default, and the Company does not cure the default
within 30 days after receipt of such notice. Such notice must specify the
default, demand that it be remedied and state that the notice is a "Notice of
Default."

     The Trustee shall not be charged with knowledge of any Event of Default
unless written notice thereof shall have been given to a Trust Officer at the
Corporate Trust Office of the Trustee by the Company, a Paying Agent, any Holder
or any agent of any Holder.

     If an Event of Default (other than an Event of Default specified in clause
(i) or (j)) occurs and is continuing, the Trustee may, by notice to the Company,
or the Holders of at least 25% in aggregate principal amount of the Securities
then outstanding, by notice to the Company and the Trustee, declare all unpaid
principal to the date of acceleration on the Securities then outstanding (if not
then due and payable) to be due and payable upon any such declaration, and the
same shall become and be immediately due and payable. If an Event of Default
specified in clause (i) or (j) occurs, all unpaid principal of the Securities
then outstanding shall ipso facto become and be immediately due and payable
without any declaration or other act on the part of the Trustee or any Holder.
The Holders of a majority in aggregate principal amount of the Securities then
outstanding by notice to the Trustee may rescind or annul such acceleration and
its consequences if (a) all existing Events of Default, other than the
nonpayment of the principal of the Securities which has become due solely by
such declaration of acceleration, have been cured or waived; (b) to the extent
the payment of such interest is lawful, interest (calculated at the rate per
annum borne by the Securities) on overdue installments of interest and overdue
principal, which has become due otherwise than by such declaration of
acceleration, has been paid; (c) the rescission would not conflict with any
judgment, order or decree of a court of competent jurisdiction; and (d) all
payments due to the Trustee and any predecessor Trustee have been made. No such
rescission, unless it otherwise so specifies, shall affect any subsequent
default or impair any right consequent thereto.

     If an Event of Default occurs and is continuing, the Trustee may, but shall
not be obligated to, pursue any available remedy by proceeding at law or in
equity to collect the payment of the principal of or interest on the Securities
or to enforce the performance of any provision of the Securities or the
Indenture. The Trustee may maintain a proceeding even if it does not possess any
of the Securities or does not produce any of them in the proceeding. A delay or
omission by the Trustee or any Holder in exercising any right or remedy accruing
upon an Event of Default shall not impair the right or remedy or constitute a
waiver of or acquiescence in the Event of Default. No remedy is exclusive of any
other remedy. All available remedies are cumulative to the extent permitted by
law.

16. TRUSTEE DEALINGS WITH THE COMPANY

     U.S. Bank National Association, the initial Trustee under the Indenture, in
its individual or any other capacity, may make loans to, accept deposits from
and perform services for the Company or an Affiliate of the Company, and may
otherwise deal with the Company or an Affiliate of the Company, as if it were
not the Trustee.

                                      A-10

<PAGE>

17. NO RECOURSE AGAINST OTHERS

     A director, officer, employee or shareholder, as such, of the Company shall
not have any liability for any obligations of the Company under the Securities
or the Indenture nor for any claim based on, in respect of or by reason of such
obligations or their creation. The Holder of this Security by accepting this
Security waives and releases all such liability. The waiver and release are part
of the consideration for the issuance of this Security.

18. AUTHENTICATION

     This Security shall not be valid until the Trustee or an authenticating
agent manually signs the certificate of authentication on the other side of this
Security.

19. ABBREVIATIONS AND DEFINITIONS

     Customary abbreviations may be used in the name of the Holder or an
assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the
entireties), JT TEN (= joint tenants with right of survivorship and not as
tenants in common), CUST (= Custodian) and UGMA (= Uniform Gifts to Minors Act).

     All terms defined in the Indenture and used in this Security but not
specifically defined herein are defined in the Indenture and are used herein as
so defined.

20. INDENTURE TO CONTROL; GOVERNING LAW

     In the case of any conflict between the provisions of this Security and the
Indenture, the provisions of the Indenture shall control. This Security and the
Indenture shall be governed by, and construed in accordance with, the laws of
the State of New York.

     The Company will furnish to any Holder, upon written request and without
charge, a copy of the Indenture. Requests may be made to: US Airways Group,
Inc., 2345 Crystal Drive, Arlington, Virginia 22227, Attention: Chief Financial
Officer, Telephone No.: (703) 872-7000.

                                      A-11

<PAGE>

                                    EXHIBIT B

                                 ASSIGNMENT FORM

To assign this Security, fill in the form below:

I or we assign and transfer this Security to

________________________________________________________________________________
                  (Insert assignee's soc. sec. or tax I.D. no.)

________________________________________________________________________________

________________________________________________________________________________
              (Print or type assignee's name, address and zip code)

and irrevocably appoint

________________________________________________________________________________

agent to transfer this Security on the books of the Company. The agent may
substitute another to act for him or her.

                                        Your Signature:

Date:
      -------------------------------   ----------------------------------------
                                        (Sign exactly as your name appears on
                                        the other side of this Security)
* Signature guaranteed by:

By:
    ---------------------------------

----------
*    The signature must be guaranteed by an institution which is a member of one
     of the following recognized signature guaranty programs: (i) the Securities
     Transfer Agent Medallion Program (STAMP); (ii) the New York Stock Exchange
     Medallion Program (MSP); (iii) the Stock Exchange Medallion Program (SEMP);
     or (iv) such other guaranty program acceptable to the Trustee.

                                       B-1

<PAGE>

                                    EXHIBIT C

            CERTIFICATE TO BE DELIVERED UPON EXCHANGE OR REGISTRATION
                      OF TRANSFER OF RESTRICTED SECURITIES

Re:  7% Senior Convertible Notes Due 2020 (the "Securities") of US Airways
     Group, Inc.

     This certificate relates to $_____ principal amount of Securities owned in
(check applicable box)

     [ ] book-entry or [ ] definitive form by ______________ (the "Transferor").

     The Transferor has requested a Registrar or the Trustee to exchange or
register the transfer of such Securities.

     In connection with such request and in respect of each such Security, the
Transferor does hereby certify that the Transferor is familiar with transfer
restrictions relating to the Securities as provided in Section 2.12 of the
Indenture dated as of September 30, 2005 by and among US Airways Group, Inc.,
the guarantors party thereto and U.S. Bank National Association, as trustee (the
"Indenture"), and the transfer of such Security is being made pursuant to an
effective registration statement under the Securities Act of 1933, as amended
(the "Securities Act") (check applicable box) or the transfer or exchange, as
the case may be, of such Security does not require registration under the
Securities Act because (check applicable box):

     [ ]  Such Security is being transferred pursuant to an effective
          registration statement under the Securities Act.

     [ ]  Such Security is being acquired for the Transferor's own account,
          without transfer.

     [ ]  Such Security is being transferred to the Company or a Subsidiary (as
          defined in the Indenture) of the Company.

     [ ]  Such Security is being transferred to a person the Transferor
          reasonably believes is a "qualified institutional buyer" (as defined
          in Rule 144A or any successor provision thereto ("Rule 144A") under
          the Securities Act) that is purchasing for its own account or for the
          account of a "qualified institutional buyer", in each case to whom
          notice has been given that the transfer is being made in reliance on
          such Rule 144A, and in each case in reliance on Rule 144A.

     [ ]  Such Security is being transferred pursuant to and in compliance with
          an exemption from the registration requirements under the Securities
          Act in accordance with Rule 144 (or any successor thereto) ("Rule
          144") under the Securities Act.

     [ ]  Such Security is being transferred to a non-U.S. Person in an offshore
          transaction in compliance with Rule 904 of Regulation S under the
          Securities Act (or any successor thereto).

     [ ]  Such Security is being transferred pursuant to and in compliance with
          an exemption from the registration requirements of the Securities Act
          (other than an exemption referred to above) and as a result of which
          such Security will, upon such transfer, cease to be a "restricted
          security" within the meaning of Rule 144 under the Securities Act.

                                       C-1

<PAGE>

     The Transferor acknowledges and agrees that, if the transferee will hold
any such Securities in the form of beneficial interests in a Global Note which
is a "restricted security" within the meaning of Rule 144 under the Securities
Act, then such transfer can only be made pursuant to (i) Rule 144A under the
Securities Act and such transferee must be a "qualified institutional buyer" (as
defined in Rule 144A) or (ii) Regulation S under the Securities Act.

Date:
      -------------------------------   ----------------------------------------
                                              (Insert Name of Transferor)

                                       C-2

<PAGE>

                                    EXHIBIT D

                               [FORM OF GUARANTEE]

     The Guarantors (as defined in the Indenture and which term includes any
successor person under the Indenture), upon the terms and subject to the
conditions set forth in the Indenture, hereby unconditionally guarantee, jointly
and severally, on a senior unsecured basis (such guarantee by each Guarantor
being referred to herein as the "Guarantee") (i) the due and punctual payment of
the principal of and interest (including contingent interest) on the Securities,
whether at maturity, by acceleration or otherwise, the due and punctual payment
of interest on the overdue principal and interest, if any, on the Securities, to
the extent lawful, and the due and punctual performance of all other obligations
of the Company to the Holders or the Trustee all in accordance with the terms
set forth in Article 11 of the Indenture and (ii) in case of any extension of
time of payment or renewal of any Securities or any of such other obligations,
that the same will be promptly paid in full when due or performed in accordance
with the terms of the extension or renewal, whether at Stated Maturity, by
acceleration or otherwise.

     The obligations of the undersigned to the Holders of the Securities and to
the Trustee pursuant to this Guarantee and in the Indenture are expressly set
forth in the Indenture and reference is hereby made to the Indenture for the
precise terms of the Guarantees and all of the other provisions of the Indenture
to which this Guarantee relates.

     No stockholder, officer, director, employee or incorporator, as such, past,
present or future, of any Guarantor shall have any liability under the Guarantee
by reason of his or its status as such stockholder, officer, director, employee
or incorporator.

     The Guarantee shall not be valid or obligatory for any purpose until the
certificate of authentication on the Securities upon which the Guarantee is
noted shall have been executed by the Trustee under the Indenture by the manual
signature of one of its authorized signatories.

     The Guarantee shall be governed by and construed in accordance with the law
of the State of New York applicable to agreements made or instruments entered
into and, in each case, performed in said state.

                                       D-1

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00091-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00091-of-00352.parquet"}]]