Document:

<PAGE>

                                                                    Exhibit 4.20

                             CLASS A-2 CERTIFICATE

                            REGISTERED $263,614,000
                         Fractional Undivided Interest

No. R - 1                                                  CUSIP NO. 909317 AZ 2

     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE TRUSTEE OR ITS
                                                   ---
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IN EXCHANGE FOR THIS CERTIFICATE IS REGISTERED IN THE NAME OF CEDE & CO.
OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC
(AND ANY PAYMENT HEREON IS MADE TO CEDE & CO.  OR TO SUCH OTHER ENTITY AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS
THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

     TRANSFERS OF THIS CERTIFICATE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT
NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S
NOMINEE AND TRANSFERS OF PORTIONS OF THIS CERTIFICATE SHALL BE LIMITED TO
TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 3.05 OF
THE PASS THROUGH TRUST AGREEMENT REFERRED TO HEREIN.

     EITHER: (A) THE HOLDER IS NOT ACQUIRING THIS CERTIFICATE OR AN INTEREST
HEREIN WITH PLAN ASSETS OF ANY PLAN OR AN INDIVIDUAL RETIREMENT PLAN SUBJECT TO
TITLE I OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED
("ERISA"), OR SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE
"CODE"); OR (B) THE HOLDER'S PURCHASE AND HOLDING OF THIS CERTIFICATE OR AN
INTEREST HEREIN ARE EXEMPT FROM THE PROHIBITED TRANSACTION RESTRICTIONS OF
SECTION 406(A) OF ERISA AND SECTION 4975 OF THE CODE BY AN ADMINISTRATIVE CLASS
PROHIBITED TRANSACTION EXEMPTION GRANTED BY THE DEPARTMENT OF LABOR.
<PAGE>

             UNITED AIRLINES 2001-1A-2 ENHANCED PASS THROUGH TRUST

                     UNITED AIRLINES ENHANCED PASS THROUGH
                         CERTIFICATE, SERIES 2001-1A-2

         Final Expected Regular Distribution Date:  September 1, 2008

evidencing a fractional undivided interest in a trust, the property of which
includes certain equipment notes each secured by an Aircraft owned by United Air
Lines, Inc.

     THIS CERTIFIES THAT CEDE & CO., for value received, is the registered owner
of a TWO HUNDRED SIXTY-THREE MILLION SIX HUNDRED FOURTEEN THOUSAND DOLLAR
($263,614,000) Fractional Undivided Interest in the United Airlines 2001-1A-2
Pass Through Trust (the "Trust") created by State Street Bank and Trust Company
of Connecticut, National Association, as trustee (the "Trustee") pursuant to a
Pass Through Trust Agreement, dated as of August 22, 2001 (the "Basic
Agreement"), as supplemented by Trust Supplement No. 2001-1A-2 (collectively,
the "Agreement") between the Trustee and United Air Lines, Inc., a Delaware
corporation (the "Company"), a summary of certain of the pertinent provisions of
which is set forth below.  To the extent not otherwise defined herein, the
capitalized terms used herein have the meanings assigned to them in the
Agreement.  This Certificate is one of the duly authorized Certificates
designated as "United Airlines Enhanced Pass Through Certificates, Series 2001-
1A-2" (the "Certificates").  This Certificate is issued under and is subject to
the terms, provisions and conditions of the Agreement.

     By virtue of its acceptance hereof, the Certificateholder of this
Certificate assents to and agrees to be bound by the provisions of the
Agreement, the Intercreditor Agreement and the Note Purchase Agreement.  The
property of the Trust includes (i) certain Notes and all monies at any time paid
thereon and all monies due and to become due thereunder, (ii) funds from time to
time deposited in the related Escrow Account, the related Certificate Account
and the related Special Payments Account, (iii) all rights of such Trust and the
Trustee, on behalf of such Trust, under the Intercreditor Agreement and the Note
Purchase Agreement, including all rights to receive certain payments thereunder
and all monies paid to such Trustee on behalf of such Trust pursuant to the
Intercreditor Agreement and the Note Purchase Agreement and (iv) all monies
receivable by the Subordination Agent under the Liquidity Facility for the Trust
(the "Trust Property").  Each issue of the Notes is secured directly or
indirectly by, among other things, a security interest in the Aircraft owned by
the Company.

     The Certificates represent Fractional Undivided Interests in the Trust and
the Trust Property, and have no rights, benefits or interest in respect of any
assets or property of any trust of another class.

     Interest applicable to this Certificate will be payable at a rate equal to
6.201%.

     Subject to and in accordance with the terms of the Agreement, the
Intercreditor Agreement and the Note Purchase Agreement, from and to the extent
of funds then available to the Trustee, there shall be distributed on each March
1 and September 1 (a "Regular Distribution Date"), commencing on March 1, 2002,
to the Person in whose name this
<PAGE>

Certificate is registered at the close of business on the 15th day preceding
such Regular Distribution Date, an amount in respect of the Scheduled Payments
on the Notes due on such Regular Distribution Date, the receipt of which has
been confirmed by the Trustee, equal to the product of the percentage interest
in the Trust evidenced by this Certificate and an amount equal to the sum of
such Scheduled Payments. Subject to and in accordance with the terms of the
Agreement, the Intercreditor Agreement and the Note Purchase Agreement, if
Special Payments on the Notes are received by the Trustee, from funds then
available to the Trustee, there shall be distributed on the applicable Special
Distribution Date, to the Person in whose name this Certificate is registered at
the close of business on the 15th day preceding the Special Distribution Date,
an amount in respect of such Special Payments on the Notes, the receipt of which
has been confirmed by the Trustee, equal to the product of the percentage
interest in the Trust evidenced by this Certificate and an amount equal to the
sum of such Special Payments so received. If a Regular Distribution Date or
Special Distribution Date is not a Business Day, distribution shall be made on
the next Business Day with the same force and effect as if made on such Regular
Distribution Date or Special Distribution Date and interest shall accrue during
the intervening period. The Trustee shall mail notice of each Special Payment
and the Special Distribution Date therefor to the Certificateholder of this
Certificate.

     Except as otherwise provided in the Agreement and notwithstanding the
above, the final distribution on this Certificate shall be made after notice
mailed by the Trustee of the pendency of such distribution and only upon
presentation and surrender of this Certificate at the office or agency of the
Trustee specified in such notice.

     THE AGREEMENT AND THIS CERTIFICATE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAWS  THEREOF (OTHER THAN SECTION 5-1401 OF THE NEW
YORK GENERAL OBLIGATIONS LAW)) AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
HOLDER OF THIS CERTIFICATE UNDER THE AGREEMENT SHALL BE DETERMINED IN ACCORDANCE
WITH SUCH LAWS.

     Reference is hereby made to the further provisions of this Certificate set
forth in the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

     Unless the certificate of authentication hereon has been executed by the
Trustee, by manual signature, this Certificate shall not be entitled to any
benefit under the Agreement or be valid or obligatory for any purpose.
<PAGE>

     IN WITNESS WHEREOF, the Trustee, on behalf of the Issuer and not in its
individual capacity, has caused this Certificate to be duly executed.

                                             UNITED AIRLINES 2001-1A-2 PASS
                                             THROUGH TRUST

                                             By:STATE STREET BANK AND TRUST
                                                COMPANY OF CONNECTICUT,
                                                NATIONAL ASSOCIATION, not in its
                                                individual capacity but solely
                                                as Trustee

Dated: August 22, 2001                       By: /s/ John G. Correia
      ------------------------                  --------------------------------
                                             Name: John G. Correia
                                                  ------------------------------
                                             Title: Assistant Vice President
                                                   -----------------------------
<PAGE>

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

   This is one of the Certificates referred to in the within-mentioned Trust
                                  Agreement.

STATE STREET BANK AND TRUST             STATE STREET BANK AND TRUST
COMPANY OF CONNECTICUT,                 COMPANY OF CONNECTICUT,
NATIONAL ASSOCIATION, not in its        NATIONAL ASSOCIATION, not in its
individual capacity but solely          individual capacity but solely
as Trustee                              as Trustee

By:/s/ John G. Correia                  By:/s/ John G. Correia
 ----------------------------              ----------------------------
                                               Authenticating Agent

                                        By:/s/ John G. Correia
                                           ----------------------------
<PAGE>

                           [REVERSE OF CERTIFICATE]

     The Certificates do not represent a direct obligation of, or an obligation
guaranteed by, or an interest in, the Company or the Trustee or any of their
Affiliates.  The Certificates are limited in right or payment, all as more
specifically set forth on the face hereof and in the Agreement.  All payments or
distributions made to Certificateholders under the Agreement shall be made only
from the Trust Property and only to the extent that the Trustee shall have
sufficient income or proceeds from the Trust Property to make such payments in
accordance with the terms of the Agreement.  Each Certificateholder of this
Certificate, by its acceptance hereof, agrees that it shall look solely to the
income and proceeds from the Trust Property to the extent available for
distribution to such Certificateholder as provided in the Agreement.  This
Certificate does not purport to summarize the Agreement and reference is made to
the Agreement for information with respect to the interests, rights, benefits,
obligations, proceeds and duties evidenced hereby.  A copy of the Agreement may
be examined during normal business hours at the principal office of the Trustee,
and at such other places, if any, designated by the Trustee, by any
Certificateholder upon request.

     The Agreement permits, with certain exceptions therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Certificateholders under the Agreement at any time
by the Company and the Trustee with the consent of the Certificateholders
holding Certificates evidencing Fractional Cumulative Interests aggregating not
less than a majority in interest in the Trust.  Any such consent by the
Certificateholder of this Certificate shall be conclusive and binding on such
Certificateholder and upon all future Certificateholders of this Certificate and
of any Certificate issued upon the transfer hereof or in exchange hereof or in
lieu hereof whether or not notation of such consent is made upon this
Certificate.  The Agreement also permits the amendment thereof, in certain
limited circumstances, without the consent of the Certificateholders of any of
the Certificates.

     As provided in the Agreement and subject to certain limitations therein set
forth, the transfer of this Certificate is registrable in the Register upon
surrender of this Certificate for registration of transfer at the offices or
agencies maintained by the Trustee in its capacity as Registrar, or by any
successor Registrar, at its Corporate Trust Office, duly endorsed or accompanied
by a written instrument of transfer in form satisfactory to the Trustee and the
Registrar duly executed by the Certificateholder hereof or such
Certificateholder's attorney duly authorized in writing, and thereupon one or
more new Certificates of authorized denominations evidencing the same aggregate
Fractional Undivided Interest in the Trust shall be issued to the designated
transferee or transferees.

     The Certificates are issuable only as registered Certificates without
coupons in minimum denominations of $1,000 Fractional Undivided Interest and
integral multiples of $1,000 in excess thereof.  As provided in the Agreement
and subject to certain limitations therein set forth, the Certificates are
exchangeable for new Certificates of authorized denominations evidencing the
same aggregate Fractional Undivided Interest in the Trust, as requested by the
Certificateholder surrendering the same.
<PAGE>

     No service charge shall be made for any such registration of transfer or
exchange, but the Trustee shall require payment by the Certificateholder of a
sum sufficient to cover any tax or governmental charge payable in connection
therewith.

     The Trustee, the Registrar, and any agent of the Trustee or the Registrar
may treat the person in whose name this Certificate is registered as the owner
hereof for all purposes, and neither the Trustee, the Registrar, nor any such
agent shall be affected by any notice to the contrary.

     The obligations and responsibilities created by the Agreement and the Trust
created thereby shall terminate upon the distribution to Certificateholders of
all amounts required to be distributed to them pursuant to the Agreement and the
disposition of all property held as part of the Trust Property.<PAGE>

                                                                    Exhibit 4.21

                             CLASS A-3 CERTIFICATE

                            REGISTERED $372,987,000
                         Fractional Undivided Interest

No. R - 1                                                  CUSIP NO. 909317 BA 6

     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE TRUSTEE OR ITS
                                                   ---
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IN EXCHANGE FOR THIS CERTIFICATE IS REGISTERED IN THE NAME OF CEDE & CO.
OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC
(AND ANY PAYMENT HEREON IS MADE TO CEDE & CO.  OR TO SUCH OTHER ENTITY AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS
THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

     TRANSFERS OF THIS CERTIFICATE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT
NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S
NOMINEE AND TRANSFERS OF PORTIONS OF THIS CERTIFICATE SHALL BE LIMITED TO
TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 3.05 OF
THE PASS THROUGH TRUST AGREEMENT REFERRED TO HEREIN.

     EITHER:  (A) THE HOLDER IS NOT ACQUIRING THIS CERTIFICATE OR AN INTEREST
HEREIN WITH PLAN ASSETS OF ANY PLAN OR AN INDIVIDUAL RETIREMENT PLAN SUBJECT TO
TITLE I OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED
("ERISA"), OR SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE
"CODE"); OR (B) THE HOLDER'S PURCHASE AND HOLDING OF THIS CERTIFICATE OR AN
INTEREST HEREIN ARE EXEMPT FROM THE PROHIBITED TRANSACTION RESTRICTIONS OF
SECTION 406(A) OF ERISA AND SECTION 4975 OF THE CODE BY AN ADMINISTRATIVE CLASS
PROHIBITED TRANSACTION EXEMPTION GRANTED BY THE DEPARTMENT OF LABOR.
<PAGE>

             UNITED AIRLINES 2001-1A-3 ENHANCED PASS THROUGH TRUST

                     UNITED AIRLINES ENHANCED PASS THROUGH
                         CERTIFICATE, SERIES 2001-1A-3

         Final Expected Regular Distribution Date:  September 1, 2013

evidencing a fractional undivided interest in a trust, the property of which
includes certain equipment notes each secured by an Aircraft owned by United Air
Lines, Inc.

     THIS CERTIFIES THAT CEDE & CO., for value received, is the registered owner
of a THREE HUNDRED SEVENTY-TWO MILLION NINE HUNDRED EIGHTY-SEVEN THOUSAND DOLLAR
($372,987,000) Fractional Undivided Interest in the United Airlines 2001-1A-3
Pass Through Trust (the "Trust") created by State Street Bank and Trust Company
of Connecticut, National Association, as trustee (the "Trustee") pursuant to a
Pass Through Trust Agreement, dated as of August 22, 2001 (the "Basic
Agreement"), as supplemented by Trust Supplement No. 2001-1A-3 (collectively,
the "Agreement") between the Trustee and United Air Lines, Inc., a Delaware
corporation (the "Company"), a summary of certain of the pertinent provisions of
which is set forth below.  To the extent not otherwise defined herein, the
capitalized terms used herein have the meanings assigned to them in the
Agreement.  This Certificate is one of the duly authorized Certificates
designated as "United Airlines Enhanced Pass Through Certificates, Series 2001-
1A-3" (the "Certificates").  This Certificate is issued under and is subject to
the terms, provisions and conditions of the Agreement.

     By virtue of its acceptance hereof, the Certificateholder of this
Certificate assents to and agrees to be bound by the provisions of the
Agreement, the Intercreditor Agreement and the Note Purchase Agreement.  The
property of the Trust includes (i) certain Notes and all monies at any time paid
thereon and all monies due and to become due thereunder, (ii) funds from time to
time deposited in the related Escrow Account, the related Certificate Account
and the related Special Payments Account, (iii) all rights of such Trust and the
Trustee, on behalf of such Trust, under the Intercreditor Agreement and the Note
Purchase Agreement, including all rights to receive certain payments thereunder
and all monies paid to such Trustee on behalf of such Trust pursuant to the
Intercreditor Agreement and the Note Purchase Agreement and (iv) all monies
receivable by the Subordination Agent under the Liquidity Facility for the Trust
(the "Trust Property").  Each issue of the Notes is secured directly or
indirectly by, among other things, a security interest in the Aircraft owned by
the Company.

     The Certificates represent Fractional Undivided Interests in the Trust and
the Trust Property, and have no rights, benefits or interest in respect of any
assets or property of any trust of another class.

     Interest applicable to this Certificate will be payable at a rate equal to
6.602%.

     Subject to and in accordance with the terms of the Agreement, the
Intercreditor Agreement and the Note Purchase Agreement, from and to the extent
of funds then available to the Trustee, there shall be distributed on each March
1 and September 1 (a "Regular Distribution Date"), commencing on March 1, 2002,
to the Person in whose name this
<PAGE>

Certificate is registered at the close of business on the 15th day preceding
such Regular Distribution Date, an amount in respect of the Scheduled Payments
on the Notes due on such Regular Distribution Date, the receipt of which has
been confirmed by the Trustee, equal to the product of the percentage interest
in the Trust evidenced by this Certificate and an amount equal to the sum of
such Scheduled Payments. Subject to and in accordance with the terms of the
Agreement, the Intercreditor Agreement and the Note Purchase Agreement, if
Special Payments on the Notes are received by the Trustee, from funds then
available to the Trustee, there shall be distributed on the applicable Special
Distribution Date, to the Person in whose name this Certificate is registered at
the close of business on the 15th day preceding the Special Distribution Date,
an amount in respect of such Special Payments on the Notes, the receipt of which
has been confirmed by the Trustee, equal to the product of the percentage
interest in the Trust evidenced by this Certificate and an amount equal to the
sum of such Special Payments so received. If a Regular Distribution Date or
Special Distribution Date is not a Business Day, distribution shall be made on
the next Business Day with the same force and effect as if made on such Regular
Distribution Date or Special Distribution Date and interest shall accrue during
the intervening period. The Trustee shall mail notice of each Special Payment
and the Special Distribution Date therefor to the Certificateholder of this
Certificate.

     Except as otherwise provided in the Agreement and notwithstanding the
above, the final distribution on this Certificate shall be made after notice
mailed by the Trustee of the pendency of such distribution and only upon
presentation and surrender of this Certificate at the office or agency of the
Trustee specified in such notice.

     THE AGREEMENT AND THIS CERTIFICATE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAWS  THEREOF (OTHER THAN SECTION 5-1401 OF THE NEW
YORK GENERAL OBLIGATIONS LAW)) AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
HOLDER OF THIS CERTIFICATE UNDER THE AGREEMENT SHALL BE DETERMINED IN ACCORDANCE
WITH SUCH LAWS.

     Reference is hereby made to the further provisions of this Certificate set
forth in the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

     Unless the certificate of authentication hereon has been executed by the
Trustee, by manual signature, this Certificate shall not be entitled to any
benefit under the Agreement or be valid or obligatory for any purpose.
<PAGE>

     IN WITNESS WHEREOF, the Trustee, on behalf of the Issuer and not in its
individual capacity, has caused this Certificate to be duly executed.

                                 UNITED AIRLINES 2001-1A-3 PASS
                                 THROUGH TRUST

                                 By:  STATE STREET BANK AND TRUST
                                      COMPANY OF CONNECTICUT,
                                      NATIONAL ASSOCIATION, not in its
                                      individual capacity but solely as Trustee

Dated: August 22, 2001           By:  /s/ John G. Correia
      --------------------           -----------------------------
                                 Name: John G. Correia
                                      ----------------------------
                                 Title: Assistant Vice President
                                       ---------------------------
<PAGE>

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Trust
                                  Agreement.

STATE STREET BANK AND TRUST               STATE STREET BANK AND TRUST
COMPANY OF CONNECTICUT,                   COMPANY OF CONNECTICUT,
NATIONAL ASSOCIATION, not in its          NATIONAL ASSOCIATION, not in its
individual capacity but solely            individual capacity but solely
as Trustee                                as Trustee

By:/s/ John.G Correia                     By: /s/ John G. Correia
   ------------------------                   ------------------------
                                                Authenticating Agent

                                          By: /s/ John G. Correia
                                              ------------------------
<PAGE>

                           [REVERSE OF CERTIFICATE]

     The Certificates do not represent a direct obligation of, or an obligation
guaranteed by, or an interest in, the Company or the Trustee or any of their
Affiliates.  The Certificates are limited in right or payment, all as more
specifically set forth on the face hereof and in the Agreement.  All payments or
distributions made to Certificateholders under the Agreement shall be made only
from the Trust Property and only to the extent that the Trustee shall have
sufficient income or proceeds from the Trust Property to make such payments in
accordance with the terms of the Agreement.  Each Certificateholder of this
Certificate, by its acceptance hereof, agrees that it shall look solely to the
income and proceeds from the Trust Property to the extent available for
distribution to such Certificateholder as provided in the Agreement.  This
Certificate does not purport to summarize the Agreement and reference is made to
the Agreement for information with respect to the interests, rights, benefits,
obligations, proceeds and duties evidenced hereby.  A copy of the Agreement may
be examined during normal business hours at the principal office of the Trustee,
and at such other places, if any, designated by the Trustee, by any
Certificateholder upon request.

     The Agreement permits, with certain exceptions therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Certificateholders under the Agreement at any time
by the Company and the Trustee with the consent of the Certificateholders
holding Certificates evidencing Fractional Cumulative Interests aggregating not
less than a majority in interest in the Trust.  Any such consent by the
Certificateholder of this Certificate shall be conclusive and binding on such
Certificateholder and upon all future Certificateholders of this Certificate and
of any Certificate issued upon the transfer hereof or in exchange hereof or in
lieu hereof whether or not notation of such consent is made upon this
Certificate.  The Agreement also permits the amendment thereof, in certain
limited circumstances, without the consent of the Certificateholders of any of
the Certificates.

     As provided in the Agreement and subject to certain limitations therein set
forth, the transfer of this Certificate is registrable in the Register upon
surrender of this Certificate for registration of transfer at the offices or
agencies maintained by the Trustee in its capacity as Registrar, or by any
successor Registrar, at its Corporate Trust Office, duly endorsed or accompanied
by a written instrument of transfer in form satisfactory to the Trustee and the
Registrar duly executed by the Certificateholder hereof or such
Certificateholder's attorney duly authorized in writing, and thereupon one or
more new Certificates of authorized denominations evidencing the same aggregate
Fractional Undivided Interest in the Trust shall be issued to the designated
transferee or transferees.

     The Certificates are issuable only as registered Certificates without
coupons in minimum denominations of $1,000 Fractional Undivided Interest and
integral multiples of $1,000 in excess thereof.  As provided in the Agreement
and subject to certain limitations therein set forth, the Certificates are
exchangeable for new Certificates of authorized denominations evidencing the
same aggregate Fractional Undivided Interest in the Trust, as requested by the
Certificateholder surrendering the same.
<PAGE>

     No service charge shall be made for any such registration of transfer or
exchange, but the Trustee shall require payment by the Certificateholder of a
sum sufficient to cover any tax or governmental charge payable in connection
therewith.

     The Trustee, the Registrar, and any agent of the Trustee or the Registrar
may treat the person in whose name this Certificate is registered as the owner
hereof for all purposes, and neither the Trustee, the Registrar, nor any such
agent shall be affected by any notice to the contrary.

     The obligations and responsibilities created by the Agreement and the Trust
created thereby shall terminate upon the distribution to Certificateholders of
all amounts required to be distributed to them pursuant to the Agreement and the
disposition of all property held as part of the Trust Property.

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