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Exhibit 10(a)

         SIXTH AMENDED AND RESTATED CREDIT AGREEMENT
(364-DAY FACILITY)

Dated as of April 25, 2002

        UNITED PARCEL SERVICE, INC., a Delaware corporation (the "Borrower"),
the banks, financial institutions and other institutional lenders (collectively,
the "Initial Lenders") party hereto, Citibank, N.A., as administrative agent
(together with any successor thereto appointed pursuant to Article VII of the
Existing Credit Agreement referred to below, in such capacity, the
"Administrative Agent") and as syndication agent (in such capacity, the
"Syndication Agent") for the Lenders (as defined in the Existing Credit
Agreement referred to below), Bank of America, N.A. and Bank One, NA, as
co-documentation agents (in such capacity, the "Co-Documentation Agents") for
the Lenders, and Salomon Smith Barney Inc., as arranger (in such capacity, the
"Arranger") under the Loan Documents (as defined in the Existing Credit
Agreement described below), hereby agree as follows:

PRELIMINARY STATEMENTS

        (1)  The Borrower is party to a Fifth Amended and Restated Credit
Agreement (364-Day Facility) dated as of April 26, 2001 (as amended,
supplemented or otherwise modified from time to time to, but not including, the
date hereof, the "Existing Credit Agreement") with the banks, financial
institutions and other institutional lenders party thereto (the "Existing
Lenders"), Citibank, N.A., as Administrative Agent and as Syndication Agent for
the Existing Lenders, ABN AMRO Bank N.V., Bank of America, N.A., Bank One, NA,
and The Chase Manhattan Bank, as Co-Documentation Agents for such Lenders, and
Salomon Smith Barney Inc., as Arranger. Capitalized terms not otherwise defined
in this Sixth Amended and Restated Credit Agreement (364-Day Facility) (the
"Amendment and Restatement") shall have the same meanings as specified in the
Existing Credit Agreement.

        (2)  The Borrower has requested that the Lenders agree to extend credit
to it from time to time in an aggregate principal amount of up to $3,750,000,000
for general corporate purposes of the Borrower and its Subsidiaries not
otherwise prohibited under the terms of this Amendment and Restatement. The
Lenders have indicated their willingness to agree to extend credit to the
Borrower from time to time in such amount on the terms and conditions of this
Amendment and Restatement.

        (3)  The parties to this Amendment and Restatement desire to amend the
Existing Credit Agreement as set forth herein and to restate the Existing Credit
Agreement in its entirety to read as set forth in the Existing Credit Agreement
with the following amendments.

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        SECTION 1.    Amendments to the Existing Credit Agreement.    Effective
as of the date of this Amendment and Restatement and subject to the satisfaction
of the conditions precedent set forth in Section 2 hereof:

        (a) The definition of "Applicable Margin" in Section 1.01 of the
Existing Credit Agreement is hereby amended in full to read as follows:

        "Applicable Margin" means (a) as of any date up to the Termination Date,
0.00% per annum for Base Rate Advances and 0.12% per annum for Eurodollar Rate
Advances and (b) as of any date from and after the Termination Date, a
percentage per annum determined by reference to the Public Debt Rating in effect
on such date as set forth below:

Public Debt Rating
S&P/Moody's

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  Applicable Margin
for Base Rate
Advances

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  Applicable Margin
for Eurodollar Rate
Advances

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Level 1
AA- / Aa3 or above   0.00%   0.300%
Level 2
Lower than Level 1 but at least A- / A3
 
0.00%
 
0.500%
Level 3
Lower than Level 2
 
0.00%
 
0.725%

provided, however, that if as of any date of determination the aggregate
principal amount of Advances outstanding exceeds 33% of the aggregate
Commitments, the Applicable Margin for such date shall be the percentage per
annum determined in accordance with clause (a) or (b) above plus 0.05%.

        (b) Section 1.01 of the Existing Credit Agreement is hereby further
amended by (i) deleting the definitions of "Existing Credit Facilities" and
"Termination Date" set forth therein and (ii) replacing them with the following
new definitions:

        "Existing Credit Facilities" means the credit facilities provided
pursuant to (a) the Fifth Amended and Restated Credit Agreement (364-Day
Facility), dated as of April 26, 2001, as amended, supplemented or otherwise
modified from time to time prior to the date hereof, among United Parcel
Service, Inc., a Delaware corporation, the banks, financial institutions and
other institutional lenders parties thereto, Citibank, N.A., as administrative
agent and syndication agent, ABN AMRO Bank N.V., Bank of America, N.A., Bank
One, NA, and The Chase Manhattan Bank, as co-documentation agents, and Salomon
Smith Barney Inc., as arranger thereunder and (b) the Second Amended and
Restated Credit Agreement (Five-year Facility) dated as of April 27, 2000, among
United Parcel Service of America, Inc., a Delaware corporation, the banks,
financial institutions and other institutional lenders parties thereto,
Citibank, N.A., as administrative agent and syndication agent, and Salomon Smith
Barney Inc. and Banc of America Securities LLC, as co-arrangers thereunder.

        "Termination Date" means the earlier of (i) April 24, 2003 or, if
extended pursuant to Section 2.16(a), the date that is 364 days after the
Termination Date then in effect, and (ii) the date of termination in whole of
the Commitments pursuant to section 2.05 or 6.01.

        (c) Section 4.01(e) of the Existing Credit Agreement is hereby amended
and restated in its entirety to read as follows:

        "(e) The Consolidated balance sheet of the Borrower and its Subsidiaries
as at December 31, 2001, and the related Consolidated statements of income and
cash flows of the Borrower and its Subsidiaries for the Fiscal Year then ended,
all audited and certified by

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Deloitte & Touche LLP, independent public accountants, copies of which have been
furnished to each Lender, fairly present the Consolidated financial condition of
the Borrower and its Subsidiaries at such dates and the Consolidated results of
the operations of the Borrower and its Subsidiaries for the periods ended on
such dates, all in accordance with GAAP consistently applied. Such balance
sheets and the notes thereto disclose all material liabilities, direct or
contingent, of the Borrower and its Subsidiaries on a Consolidated basis as of
the dates thereof."

        (d) Section 4.01(f) of the Existing Credit Agreement is amended by
replacing the words "December 31, 2000" with the words "December 31, 2001."

        (e) Section 8.07(a)(vi) is hereby amended by deleting the figure
"$3,000" therein and substituting therefor the new figure "$3,500".

        (f) Section 8.07(a) is hereby amended (i) by deleting at the end of
clause (vii) thereof ", and" and substituting therefor the punctuation ",",
(ii) by deleting at the end of clause (viii) thereof the punctuation "." and
substituting therefor ", and" and (iii) by adding at the end thereof the
following new clause (ix):

        "(ix) notwithstanding any other provision set forth in this Agreement, a
Lender may assign to one or more Eligible Assignees all or a portion of its
rights and obligations under this Agreement (including, without limitation, all
or a portion of its Commitment, the Revolving Credit Advances owing to it and
the Revolving Credit Note or Notes held by it) upon notice to the Borrower and
the Administrative Agent, with or without the consent of the Borrower, so long
as any Event of Default shall have occurred and be continuing."

        (g) Schedule I to the Existing Credit Agreement is deleted in its
entirety and replaced with Schedule I to this Amendment and Restatement.

        SECTION 2.    Conditions of Effectiveness of this Amendment and
Restatement.    This Amendment and Restatement shall become effective as of the
date first above written (the "Restatement Effective Date") when and only if:

        (a) The Administrative Agent shall have received counterparts of this
Amendment and Restatement executed by the Borrower, each of the Guarantors and
all of the Initial Lenders or, as to any of the Initial Lenders, advice
satisfactory to the Administrative Agent that such Initial Lender has executed
this Amendment and Restatement.

        (b) The Administrative Agent shall have received on or before the
Restatement Effective Date the following, each dated such date and (unless
otherwise specified below) in form and substance satisfactory to the
Administrative Agent and (except for the Revolving Credit Notes) in sufficient
copies for each Initial Lender:

        (i) The new Revolving Credit Notes issued in connection with this
Amendment and Restatement to the order of each of the Lenders which has a
Commitment in a different amount from that, if any, with respect to the Existing
Credit Agreement.

        (ii) Certified copies of the resolutions of the board of directors of
the Borrower approving this Amendment and Restatement, the Notes and all
documents evidencing other necessary corporate action and governmental
approvals, if any, with respect to this Amendment and Restatement and the Notes.

        (iii) Certified copies of the resolutions of the board of directors of
each of the Guarantors approving this Amendment and Restatement and all
documents evidencing other necessary corporate action and governmental
approvals, if any, with respect to this Amendment and Restatement.

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        (iv) A certificate of the Secretary or an Assistant Secretary of each of
the Guarantors certifying the names and true signatures of the officers of such
Guarantor authorized to sign this Amendment and Restatement and the other
documents to be delivered hereunder.

        (v) A certificate of the Secretary or an Assistant Secretary of the
Borrower certifying the names and true signatures of the officers of the
Borrower authorized to sign this Agreement, the Notes and the other documents to
be delivered hereunder.

        (vi) A favorable opinion of King & Spalding, counsel for the Borrower,
in substantially the form of Exhibit G to the Existing Credit Agreement, but
with such modifications as are required to address the Existing Credit
Agreement, as amended by this Amendment and Restatement, in each such case in
form and substance reasonably satisfactory to the Initial Lenders.

        (vii) A favorable opinion of Shearman & Sterling, counsel for the
Administrative Agent, in form and substance reasonably satisfactory to the
Administrative Agent.

        (c) The representations and warranties contained in Section 4.01 of the
Existing Credit Agreement shall be correct on and as of the Restatement
Effective Date, before and after giving effect to the Restatement Effective
Date, as though made on and as of such date.

        (d) No event shall have occurred and be continuing, or shall occur as a
result of the occurrence of the Restatement Effective Date, that constitutes a
Default.

        (e) The Existing Borrower shall have paid all fees and amounts due and
payable.

        SECTION 3.    Affirmation of Guaranty.    Each of the Guarantors hereby
consents to the execution and delivery of this Amendment and Restatement and
ratifies and confirms its obligations under the Guaranty dated April 30, 1998,
which obligations shall remain in full force and effect notwithstanding the
provisions of this Amendment and Restatement or any other amendment and
restatement thereto heretofore executed. Each of the Guarantors further agrees
that all references to "the Borrower" in the above referenced Guaranty shall be
deemed to be references to the Borrower hereunder.

        SECTION 4.    Reference to and Effect on the Existing Credit Agreement
and the Notes.    (a) On and after the effectiveness of this Amendment and
Restatement, each reference in the Existing Credit Agreement to "this
Agreement", "hereunder", "hereof" or words of like import referring to the
Existing Credit Agreement, and each reference in the Notes to "the Credit
Agreement", "thereunder", "thereof" or words of like import referring to the
Existing Credit Agreement, shall mean and be a reference to the Existing Credit
Agreement, as amended by this Amendment and Restatement.

        (b) The Existing Credit Agreement and the Notes, as specifically amended
by this Amendment and Restatement, are and shall continue to be in full force
and effect and are hereby in all respects ratified and confirmed.

        (c) Without limiting any of the other provisions of the Existing Credit
Agreement, as amended by this Amendment and Restatement, any references in the
Existing Credit Agreement to the phrases "on the date hereof", "on the date of
this Agreement" or words of similar import shall mean and be a reference to the
date of the Existing Credit Agreement (which is April 26, 2001).

        SECTION 5.    Costs and Expenses.    The Borrower agrees to pay on
demand all reasonable out-of-pocket costs and expenses of the Administrative
Agent in connection with the preparation, execution, delivery and
administration, modification and amendment of this Amendment and Restatement,
the Notes and the other documents to be delivered hereunder (including, without
limitation, the reasonable and documented fees and expenses of counsel for the
Administrative Agent with respect hereto and thereto) in accordance with the
terms of Section 8.04 of the Existing Credit Agreement.

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        SECTION 6.    Execution in Counterparts.    This Amendment and
Restatement may be executed in any number of counterparts and by different
parties hereto in separate counterparts, each of which when so executed shall be
deemed to be an original and all of which taken together shall constitute one
and the same agreement. Delivery of an executed counterpart of a signature page
to this Amendment and Restatement by telecopier shall be effective as delivery
of an original executed counterpart of such signature page.

        SECTION 7.    Governing Law.    This Amendment and Restatement shall be
governed by, and construed in accordance with, the laws of the State of New
York.

[Remainder of this Page Intentionally Left Blank]

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        IN WITNESS WHEREOF, the parties hereto have caused this Amendment and
Restatement to be executed by their respective officers thereunto duly
authorized, as of the date first above written.

    UNITED PARCEL SERVICE, INC., as Borrower
 
 
By
 
         

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    Name:
Title:
 
 
UNITED PARCEL SERVICE, INC., a New York corporation, as Guarantor
 
 
By
 
         

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    Name:
Title:
 
 
UNITED PARCEL SERVICE, INC., an Ohio corporation, as Guarantor
 
 
By
 
         

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    Name:
Title:
 
 
UNITED PARCEL SERVICE CO., a Delaware corporation, as Guarantor
 
 
By
 
         

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    Name:
Title:

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    THE AGENTS
 
 
CITIBANK, N.A.,
as Administrative Agent, Syndication Agent and Lender
 
 
By
 
         

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    Name:
Title:

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    THE INITIAL LENDERS
 
 
CITIBANK, N.A.
 
 
By
 
         

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Name:
Title:

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    ABN AMRO BANK, N.V.
 
 
By
 
         

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Name:
Title:
 
 
By
 
         

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Name:
Title:

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    BANK OF AMERICA, N.A.
 
 
By
 
         

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Name:
Title:

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    BANK ONE, NA
 
 
By
 
         

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Name:
Title:

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    BNP PARIBAS
 
 
By
 
         

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Name:
Title:
 
 
By
 
         

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Name:
Title:

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    JP MORGAN CHASE BANK
 
 
By
 
         

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Name:
Title:

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    MELLON BANK, N.A.
 
 
By
 
         

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Name:
Title:

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    BARCLAYS BANK PLC
 
 
By
 
         

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Name:
Title:

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    CREDIT SUISSE FIRST BOSTON
 
 
By
 
         

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Name:
Title:
 
 
By
 
         

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Name:
Title:

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    STANDARD CHARTERED BANK
 
 
By
 
         

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Name:
Title:
 
 
By
 
         

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Name:
Title:

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    WACHOVIA BANK, N.A.
 
 
By
 
         

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Name:
Title:

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    WELLS FARGO BANK, N.A.
 
 
By
 
         

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Name:
Title:

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    DRESDNER BANK AG,
NEW YORK AND GRAND CAYMAN BRANCHES
 
 
By
 
         

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Name:
Title:
 
 
By
 
         

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Name:
Title:

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    MERRILL LYNCH BANK USA
 
 
By
 
         

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Name:
Title:

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    ROYAL BANK OF CANADA
 
 
By
 
         

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Name:
Title:

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    SANPAOLO IMI S.p.A.
 
 
By
 
         

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Name:
Title:
 
 
By
 
         

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Name:
Title:

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    UBS AG, Stamford Branch
 
 
By
 
         

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Name:
Title:
 
 
By
 
         

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Name:
Title:

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    STATE STREET BANK AND TRUST COMPANY
 
 
By
 
         

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Name:
Title:

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    MIZUHO CORPORATE BANK, LIMITED
 
 
By
 
         

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Name:
Title:

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SCHEDULE I TO THE AMENDMENT AND RESTATEMENT
COMMITMENTS AND APPLICABLE LENDING OFFICES

Name of Lender

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  Commitment

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  Domestic Lending Office

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  Eurodollar Lending Office

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Citibank, N.A.   $ 550,000,000   Citibank, N.A.
2 Penns Way Suite 200
New Castle, DE 19720
Attn: Pat Dimery
T: (302) 894-6023
F: (302) 894-6120   Citibank, N.A.
2 Penns Way Suite 200
New Castle, DE 19720
Attn: Pat Dimery
T: (302) 894-6023
F: (302) 894-6120 ABN AMRO Bank, N.V.   $ 300,000,000   ABN AMRO Bank N.V.
208 South LaSalle St., Suite 1500
Chicago, IL 60604-1003
Attn: Loan Administration
T: (312) 992-5160
F: (312) 992-5155   ABN AMRO Bank N.V.
208 South LaSalle St., Suite 1500
Chicago, IL 60604-1003
Attn: Loan Administration
T: (312) 992-5160
F: (312) 992-5155 Bank of America, N.A.   $ 400,000,000   Bank of America
901 Main Street
Dallas, TX 75202
Attn: Chester Celestine
T: (214) 209-3798
F: (214) 290-9486   Bank of America
901 Main Street
Dallas, TX 75202
Attn: Chester Celestine
T: (214) 209-3798
F: (214) 290-9486 Bank One, NA   $ 350,000,000   Bank One, NA
1 Bank One Plaza
Chicago, IL 60670
Attn: Mark Gibbs
T: (312) 732-7624
F: (312) 732-1117   Bank One, NA
1 Bank One Plaza
Chicago, IL 60670
Attn: Mark Gibbs
T: (312) 732-7624
F: (312) 732-1117 BNP Paribas   $ 300,000,000         JP Morgan Chase Bank   $
300,000,000   JP Morgan Chase Bank
1 Chase Manhattan Plaza
8th Floor
New York, NY 10081
Attn: May Fong
T: (212) 552-7314
F: (212) 552-5650   JP Morgan Chase Bank
1 Chase Manhattan Plaza
8th Floor
New York, NY 10081
Attn: May Fong
T: (212) 552-7314
F: (212) 552-5650 Royal Bank of Canada   $ 75,000,000   Royal Bank of Canada,
New York Branch
One Liberty Plaza, 3rd Floor
New York, NY 10006-1404
Attn: Manager, Loans
Administration
T: (212) 428-6322
F: (212) 428-2372   Royal Bank of Canada,
New York Branch
One Liberty Plaza, 3rd Floor
New York, NY 10006-1404
Attn: Manager, Loans
Administration
T: (212) 428-6322
F: (212) 428-2372

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Wachovia Bank, N.A.   $ 150,000,000   Wachovia Bank, N.A.
201 South College Street
Charlotte, NC 28288-1183
Attn: Ida Blake
T: (704) 383-7912
F: (704) 374-2802   Wachovia Bank, N.A.
201 South College Street
Charlotte, NC 28288-1183
Attn: Ida Blake
T: (704) 383-7912
F: (704) 374-2802 Barclays Bank Plc   $ 150,000,000   Barclays Bank Plc
222 Broadway
New York, NY 10038
Attn: Christina Challenger-Batiz
T: (212) 412-3701
F: (212) 412-5306   Barclays Bank Plc
222 Broadway
New York, NY 10038
Attn: Christina Challenger-Batiz
T: (212) 412-3701
F: (212) 412-5306 Credit Suisse First Boston   $ 150,000,000   Credit Suisse
First Boston
11 Madison Avenue
New York, NY 10010-3629
Attn: Robert Finney
T: (212) 325-9038
F: (212) 325-8319   Credit Suisse First Boston
11 Madison Aveune
New York, NY 10010-3629
Attn: Robert Finney
T: (212) 325-9038
F: (212) 325-8319 Dresdner Bank AG,
New York and Grand Cayman Branches   $ 125,000,000   Dresdner Bank
75 Wall Street
New York, NY 10005
Attn: Deborah Carlson
T: (212) 429-2244
F: (212) 429-2524   Dresdner Bank
75 Wall Street
New York, NY 10005
Attn: Deborah Carlson
T: (212) 429-2244
F: (212) 429-2524 Mellon Bank, N.A.   $ 300,000,000   Mellon Bank, N.A.
One Mellon Bank Center
Pittsburgh, PA
15258-0001
Attn: Daniel Lenckos
T: (412) 234-0733
F: (412) 236-1914   Mellon Bank, N.A.
One Mellon Bank Center
Pittsburgh, PA
15258-0001
Attn: Daniel Lenckos
T: (412) 234-0733
F: (412) 236-1914 Wells Fargo Bank, National Association   $ 150,000,000   Wells
Fargo Bank, N.A.
201 Third Street—8th Floor
MAC A0187-081
San Francisco, CA 94103
Attn: Maria Belle Garcia
T: (415) 477-5471
F: (415) 979-0675   Wells Fargo Bank, N.A.
201 Third Street—8th Floor
MAC A0187-081
San Francisco, CA 94103
Attn: Maria Belle Garcia
T: (415) 477-5471
F: (415) 979-0675 Mizuho Corporate Bank, Limited   $ 25,000,000   Mizuho
Corporate Bank, Limited
1251 Avenue of the Americas
New York, NY 10020-1104
Attn: Christine Francese
T: (212) 282-4097
F: (212) 282-4480/4481   Mizuho Corporate Bank, Limited
1251 Avenue of the Americas
New York, NY 10020-1104
Attn: Christine Francese
T: (212) 282-4097
F: (212) 282-4480/4481 Merrill Lynch Bank USA   $ 75,000,000   Merrill Lynch
Bank USA
15 W. South Temple, Suite 300
Salt Lake City, UT 84101
Attn: Butch Alder
T: (801) 526-8324
F: (801) 531-7470   Merrill Lynch Bank USA
15 W. South Temple, Suite 300
Salt Lake City, UT 84101
Attn: Butch Alder
T: (801) 526-8324
F: (801) 531-7470

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San Paolo IMI S.p.A.   $ 75,000,000   San Paolo IMI S.p.A.
245 Park Avenue
New York, NY 10167
Attn: Glen Binder
T: (212) 692-3016
F: (212) 692-3178   San Paolo IMI S.p.A.
245 Park Avenue
New York, NY 10167
Attn: Glen Binder
T: (212) 692-3016
F: (212) 692-3178 Standard Chartered Bank   $ 150,000,000   Standard Chartered
Bank
1285 Avenue of the Americas
New York, NY 10019
Attn: Vijayant Jain
T: (212) 969-7693
F: (212) 649-7556   Standard Chartered Bank
1285 Avenue of the Americas
New York, NY 10019
Attn: Vijayant Jain
T: (212) 969-7693
F: (212) 649-7556 State Street Bank and Trust Company   $ 50,000,000   State
Street Bank and Trust Company
2 Avenue De Lafayette
Boston, MA 02111
Attn: Ms. C. Jaynelle Landy
T: (617) 662-3677
F: (617) 662-4201   State Street Bank and Trust Company
2 Avenue De Lafayette
Boston, MA 02111
Attn: Ms. C. Jaynelle Landy
(617) 662-3677
F: (617) 662-4201 UBS AG, Stamford Branch   $ 75,000,000   UBS AG, Stamford
Branch
677 Washington Blvd.
Stamford, CT 06901
Attn: Vladimira Holeckova
T: (203) 719-6403
F: (203) 719-3888   UBS AG, Stamford Branch
677 Washington Blvd.
Stamford, CT 06901
Attn: Vladimira Holeckova
T: (203) 719-6403
F: (203) 719-3888

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TOTAL OF COMMITMENTS            $3,750,000,000

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QuickLinks

Exhibit 10(a)

PRELIMINARY STATEMENTS