Document:

<PAGE>
                                                                   EXHIBIT 10(s)

                              AMENDMENT AND CONSENT

         AMENDMENT AND CONSENT dated as of February 7, 2002 (this "Agreement")
by the undersigned persons (the "Parties").

                             PRELIMINARY STATEMENTS

                  A. The Parties are parties to certain Operative Documents
referred to in the Amended and Restated Participation Agreement dated as of
September 2, 1998 (the "Participation Agreement") among Williams Communications,
LLC, formerly Williams Communications, Inc. ("WCLLC"), State Street Bank and
Trust Company of Connecticut, National Association, not in its individual
capacity except as expressly set forth therein, but solely as Trustee (the
"Trustee"), the persons named therein as note purchasers and their permitted
successors and assigns (the "Note Holders"), the persons named therein as
certificate purchasers and their permitted successors and assigns (the
"Certificate Holders"), the persons named therein as APA Purchasers and their
permitted successors and assigns (the "APA Purchasers"), State Street Bank and
Trust Company ("State Street"), not in its individual capacity but solely as
collateral agent (the "Collateral Agent"), and Citibank, N.A., in its capacity
as agent for the Note Holders and the Certificate Holders (the "Agent").

                  B. The Williams Companies, Inc. (the "Guarantor"), the
Trustee, the Collateral Agent, the Agent and Citibank, N.A., as agent for the
APA Purchasers, are parties to the Second Amended and Restated Guaranty
Agreement, dated as of August 17, 2000 (as amended through the date hereof, the
"Guaranty").

                  C. The Guarantor has requested certain amendments to the
Guaranty.

                  D. The Parties, other than the Guarantor, are willing to
consent to such amendments, subject to the terms and conditions set forth in
this Agreement.

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein contained, the Parties agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

                  1.1 Defined Terms. As used in this Agreement, (i) terms
defined in the first paragraph, preliminary statements or other sections of this
Agreement shall have the meanings set forth therein, and (ii) capitalized terms
used in this Agreement and not otherwise defined herein shall have the meanings
set forth in Appendix A to the Participation Agreement and the other Operative
Documents referred to therein.

<PAGE>

                                   ARTICLE II

                                   AMENDMENTS

                  2.1 Amendment of Section 1.01. Section 1.01 of the Guaranty is
hereby amended as follows:

                  (a) The definition of "Debt" in such Section 1.01 is hereby
amended and restated to read in its entirety as follows:

                  "Debt" means, in the case of any Person, (i) indebtedness of
         such Person for borrowed money, (ii) obligations of such Person
         evidenced by bonds, debentures or notes, (iii) obligations of such
         Person to pay the deferred purchase price of property or services
         (other than trade payables not overdue by more than 60 days incurred in
         the ordinary course of business), (iv) monetary obligations of such
         Person as lessee under leases that are, in accordance with generally
         accepted accounting principles, recorded as capital leases, (v)
         obligations of such Person under guaranties in respect of, and
         obligations (contingent or otherwise) to purchase or otherwise acquire,
         or otherwise to assure a creditor against loss in respect of,
         indebtedness or obligations of others of the kinds referred to in
         clauses (i) through (iv) of this definition and (vi) indebtedness or
         obligations of others of the kinds referred to in clauses (i) through
         (v) of this definition secured by any Lien on or in respect of any
         property of such Person; provided, however, that (w) Debt shall not
         include any obligations of the Guarantor in respect of the FELINE PACS;
         (x) Debt shall not include any obligation under or resulting from any
         agreement referred to in paragraph (y) of Schedule I; (y) in the case
         of the Guarantor, Debt shall not include any contingent obligation of
         the Guarantor relating to indebtedness incurred by any Williams SPV,
         WCG or a WCG Subsidiary pursuant to the WCG Structured Financing
         (except that in the event that the WCG Refinancing Transaction shall
         have occurred, then Debt shall include the aggregate amount of the WCG
         Structured Financing for which the Guarantor or any of its Subsidiaries
         shall have become directly and primarily liable); and (z) it is the
         understanding of the parties hereto that Debt shall not include any
         monetary obligations or guaranties of monetary obligations of Persons
         as lessee under leases that are, in accordance with generally accepted
         accounting principles, recorded as operating leases.

                  (b) The following definition of "FELINE PACS" is hereby
inserted in the alphabetically appropriate location in such Section 1.01:

                  "FELINE PACS" means those certain units, as described in the
         Guarantor's prospectus supplement dated January 7, 2002, issued by the
         Guarantor in January, 2002 in an aggregate face amount of
         $1,100,000,000.

                  (c) The definition of "Net Worth" in such Section 1.01 is
hereby amended and restated to read in its entirety as follows:

                                       2
<PAGE>

                  "Net Worth" of any Person means, as of any date of
         determination the excess of total assets of such Person over total
         liabilities of such Person, total assets and total liabilities each to
         be determined in accordance with generally accepted accounting
         principles; provided, however, that for purposes of calculating Net
         Worth, total liabilities shall not include any obligations of the
         Guarantor in respect of the FELINE PACS.

                  (d) The definition of "WCG Note" is hereby inserted in the
alphabetically appropriate location in such Section 1.01:

                  "WCG Note" means that certain promissory note dated March 28,
         2001 issued by WCG to WCG Note Trust, a Delaware business trust, in a
         principal amount of $1,500,000,000 with a maturity date of March 31,
         2008.

                  (e) The definition of "WCG Refinancing Transaction" is hereby
inserted in the alphabetically appropriate location in such Section 1.01:

                  "WCG Refinancing Transaction" means any transaction or series
         of related transactions pursuant to which the Guarantor or any
         Subsidiary of the Guarantor becomes directly and primarily liable to
         the holders of the WCG Senior Notes for an aggregate amount not
         exceeding the outstanding principal amount of the WCG Senior Notes,
         together with all accrued and unpaid interest thereon, any fees, and
         any premiums or make-whole payments payable as a result of a prepayment
         or early redemption of the WCG Senior Notes, including, without
         limitation, by means of (i) any amendment to the transaction documents
         pursuant to which the WCG Senior Notes were issued, (ii) an exchange
         offer or tender offer for the WCG Senior Notes or the WCG Note in
         consideration for which the Guarantor or any Subsidiary of the
         Guarantor issues debt securities of the Guarantor or any Subsidiary of
         the Guarantor, (iii) any redemption or repurchase, in whole or in part,
         of the WCG Senior Notes by the Guarantor or any Subsidiary of the
         Guarantor, (iv) any exercise of the "Share Trust Release Option" as
         defined in the transaction documents pursuant to which the WCG Senior
         Notes were issued, or (v) the Guarantor or any Subsidiary of the
         Guarantor making any payments in respect of the WCG Senior Notes or the
         WCG Note.

                  (f) The definition of "WCG Reimbursement Obligations" is
hereby inserted in the alphabetically appropriate location in such Section 1.01:

                  "WCG Reimbursement Obligations" means any obligations of any
         WCG Subsidiary in favor of the Guarantor, any Subsidiary of the
         Guarantor or the WCG Senior Notes Issuer pursuant to which such WCG
         Subsidiary has agreed to pay the Guarantor, any Subsidiary of the
         Guarantor or the WCG Senior Notes Issuer an amount equal to or less
         than the total amount of the obligations incurred by the Guarantor
         and/or its Subsidiaries in connection with the WCG Refinancing
         Transaction, including, without limitation, in respect of principal,
         interest, fees and any premiums or make-whole payments payable as a
         result of a prepayment or early redemption of the WCG Senior Notes.

                                       3
<PAGE>

                  (g) The definition of "WCG Senior Notes" is hereby inserted in
the alphabetically appropriate location in such Section 1.01:

                  "WCG Senior Notes" means those certain 8.25% Senior Secured
         Notes due 2004 in an aggregate principal amount of $1,400,000,000
         issued by the WCG Senior Notes Issuer.

                  (h) The definition of "WCG Senior Notes Issuer" is hereby
inserted in the alphabetically appropriate location in such Section 1.01:

                  "WCG Senior Notes Issuer" means, collectively, WCG Note Trust,
a Delaware business trust, and WCG Note Corp., Inc., a Delaware corporation.

                  2.2 Amendment of Section 4.02. Section 4.02 of the Guaranty is
hereby amended as follows:

                  (a) Clause (c) of Section 4.02 is hereby amended by deleting
the period at the end of subclause (iv) thereof, inserting in its place a
semicolon and inserting the following new subclause (v) immediately following
the existing clause (iv):

                  "(v) Williams Pipeline Company, LLC from (1) selling,
         conveying or otherwise transferring all or substantially all of its
         assets to another Person or (2) merging or consolidating with or into
         another Person, in either case, for fair-market value and on
         commercially reasonable terms and conditions in the good faith judgment
         of the Guarantor."

                  (b) Clause (e) of Section 4.02 is hereby amended and restated
to read in its entirety as follows:

                  "(e) Loans and Advances; Investments. Make or permit to remain
         outstanding, or allow any of its Subsidiaries to make or permit to
         remain outstanding, any loan or advance to, or own, purchase or acquire
         any obligations or debt securities of, any WCG Subsidiary, except that
         the Guarantor and its Subsidiaries may (i) permit to remain outstanding
         loans and advances to a WCG Subsidiary existing as of the date hereof
         and listed on Exhibit A hereof (and such WCG Subsidiaries may permit
         such loans and advances to remain outstanding), (ii) purchase or
         acquire the WCG Senior Notes or the WCG Note pursuant to the WCG
         Refinancing Transaction, and (iii) purchase or acquire and permit to
         remain outstanding, the WCG Reimbursement Obligations. Except for those
         investments in existence on the date hereof and listed on Exhibit A
         hereof, purchases or acquisitions pursuant to the WCG Refinancing
         Transaction and purchases or acquisitions of WCG Reimbursement
         Obligations, the Guarantor shall not, and shall not permit any of its
         Subsidiaries to, acquire or otherwise invest in any stock or other
         equity or other ownership interest in a WCG Subsidiary."

                  (c) Clause (i) of Section 4.02 is hereby amended by deleting
the period at the end of the existing clause (i) and inserting in its place the
following:

                                       4
<PAGE>

                  "; provided, however, that nothing contained herein shall
         prohibit or otherwise restrict the ability of the Guarantor or any
         Subsidiary of the Guarantor from incurring liability pursuant to the
         WCG Refinancing Transaction."

                                   ARTICLE III

                          REPRESENTATION AND WARRANTIES

                  3.1 Representations and Warranties of the Guarantor. To induce
the other Parties to enter into this Agreement, the Guarantor hereby reaffirms
as to itself and its Subsidiaries, as of the date hereof, its representations
and warranties contained in Section 3.01 of the Guaranty (except to the extent
such representations and warranties relate solely to an earlier date) and
additionally represents and warrants as follows:

                  (a) The Guarantor is duly organized, validly existing and in
         good standing under the laws of the State of Delaware and has all
         corporate powers and all governmental licenses, authorizations,
         certificates, consents and approvals required to carry on its business
         as now conducted in all material respects, except for those licenses,
         authorizations, certificates, consents and approvals which the failure
         to have could not reasonably be expected to have a material adverse
         effect on the business, assets, condition or operation of the Guarantor
         and its Subsidiaries taken as a whole. Each Material Subsidiary of the
         Guarantor is duly organized or validly formed, validly existing and (if
         applicable) in good standing under the laws of its jurisdiction of
         incorporation or formation, except where the failure to be so
         organized, existing and in good standing could not reasonably be
         expected to have a material adverse effect on the business, assets,
         condition or operations of the Guarantor and its Subsidiaries taken as
         a whole. Each Material Subsidiary of the Guarantor has all corporate or
         limited liability company powers and all governmental licenses,
         authorizations, certificates, consents and approvals required to carry
         on its business as now conducted in all material respects, except for
         those licenses, authorizations, certificates, consents and approvals
         which the failure to have could not reasonably be expected to have a
         material adverse effect on the business, assets, condition or operation
         of the Guarantor and its Subsidiaries taken as a whole.

                  (b) The execution, delivery and performance by the Guarantor
         of this Agreement and the consummation of the transactions contemplated
         by this Agreement are within the Guarantor's corporate powers, have
         been duly authorized by all necessary corporate action, do not
         contravene (i) the Guarantor's charter or by-laws or (ii) any law or
         any contractual restriction binding on or affecting the Guarantor and
         will not result in or require the creation or imposition of any Lien.

                  (c) No authorization or approval or other action by, and no
         notice to or filing with, any governmental authority or regulatory body
         is required for the due execution, delivery and performance by the
         Guarantor of this Agreement or the consummation of the transactions
         contemplated by this Agreement.

                  (d) This Agreement has been duly executed and delivered by the
         Guarantor. This Agreement and the Guaranty as amended by this Agreement
         are the legal, valid and

                                       5
<PAGE>

         binding obligations of the Guarantor enforceable against the Guarantor
         in accordance with its terms, except as such enforceability may be
         limited by any applicable bankruptcy, insolvency, reorganization,
         moratorium or similar law affecting creditors' rights generally and by
         general principles of equity.

                  (e) Except as set forth in the Public Filings and except for
         certain class-action lawsuits filed on or after January 29, 2002
         alleging fraud and other violations of applicable securities laws,
         there is, as to the Guarantor, no pending or, to the knowledge of the
         Guarantor, threatened action or proceeding affecting the Guarantor or
         any material Subsidiary of the Guarantor before any court, governmental
         agency or arbitrator, which could reasonably be expected to materially
         and adversely affect the financial condition or operations of the
         Guarantor and its Subsidiaries taken as a whole or which purports to
         affect the legality, validity, binding effect or enforceability of this
         Agreement, the Guaranty or any other Operative Document. For the
         purposes of this Section, "Public Filings" shall mean the Guarantor's
         annual report on Form 10-K for the year ended December 31, 2000, and
         the Guarantor's quarterly reports on Form 10-Q for the quarters ended
         March 31, 2001, June 30, 2001 and September 30, 2001.

                  (f) Upon giving effect to this Agreement, no event has
         occurred and is continuing which constitutes a Guaranty Default or
         which would constitute a Guaranty Default but for the requirement that
         notice be given or time elapse or both.

                                   ARTICLE IV

                                  MISCELLANEOUS

                  4.1 Effectiveness. The effectiveness of this Agreement is
conditioned upon receipt by the Agent of all the following documents, each in
form and substance satisfactory to the Agent:

                  (a) Counterparts of this Agreement executed by the Guarantor,
         WCLLC, the Agent, the Majority Holders and by CXC and the Majority
         Purchasers (as defined in the APA);

                  (b) A certificate of the Secretary or Assistant Secretary of
         the Guarantor as to (i) any changes (or the absence of changes) since
         August 17, 2001 to its certificate of incorporation and its by-laws as
         of the date hereof, (ii) the resolutions of the Guarantor authorizing
         the execution of this Agreement and (iii) the names and true signatures
         of the officers authorized to execute this Agreement; and

                  (c) Such other documents as the Agent shall have reasonably
         requested.

                  4.2 Trustee. The undersigned Note Holders and Certificate
Holders hereby (a) direct the Trustee to give its consent to the actions
contemplated hereby by executing and delivering this Agreement, and (b) consent
to the execution and delivery by the Trustee of this Agreement.

                                       6
<PAGE>

                  4.3 Consent. Pursuant to the APA, CXC and the Majority
Purchasers hereby consent to execution of this Agreement by the SPV.

                  4.4 Full Force and Effect. Except as specifically amended
hereby, the Operative Documents and the Securitization Documents shall remain in
full force and effect and are hereby ratified and confirmed. All references to
the Guaranty in any other document, instrument, agreement or writing shall
hereafter be deemed to refer to the Guaranty as amended hereby.

                  4.5 Exculpation of the Trustee. Except for its own gross
negligence and willful misconduct and as otherwise expressly provided in the
Operative Documents, it is expressly understood and agreed by the parties hereto
that (a) this Agreement is executed and delivered by the Trustee, not in its
individual capacity but solely as Trustee under the Declaration of Trust, in the
exercise of the powers and authority conferred and vested in it as the Trustee,
(b) each of the undertakings and agreements herein made on the part of the
Trustee is made and intended not as a personal representation, undertaking and
agreement by the Trustee but is made and intended for the purpose for binding
only the Trust Estate created by the Declaration of Trust, (c) nothing herein
contained shall be construed as creating any liability on the Trustee,
individually or personally, to perform any obligation of the Trustee either
expressed or implied contained herein or in the Operative Documents, all such
liability, if any, being expressly waived by the Parties and by any Person
lawfully claiming by, through or under the Parties and (d) under no
circumstances shall the Trustee be personally liable for the payment of any
indebtedness or expenses of the Trustee or be liable for the breach or failure
of any obligation, representation, warranty or covenant made or undertaken by
the Trustee under the Operative Documents.

                  4.6 Exculpation of the Collateral Agent. Except for its own
gross negligence and willful misconduct and as otherwise provided in the
Operative Documents, it is expressly understood and agreed by the parties hereto
that (a) this Agreement is executed and delivered by the Collateral Agent, not
in its individual capacity but solely as Collateral Agent, under the Interparty
Agreement, in the exercise of the powers and authority conferred and vested in
it as the Collateral Agent, (b) nothing herein contained shall be construed as
creating any liability on the Collateral Agent, individually or personally, to
perform any obligation of the Collateral Agent either expressed or implied
contained herein or in the Operative Documents, all such liability, if any,
being expressly waived by the Parties and by any Person claiming by, through or
under the Parties and (c) under no circumstances shall the Collateral Agent be
personally liable for the payment of any indebtedness or expenses of the
Collateral Agent or be liable for the breach or failure of any obligation,
representation, warranty or covenant made or undertaken by the Collateral Agent
under this Agreement or the Operative Documents except where such breach or
failure is the result of the Collateral Agent's willful misconduct or gross
negligence.

                  4.7 Governing Law. THIS AGREEMENT SHALL BE A CONTRACT MADE
UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK (WITHOUT GIVING
EFFECT TO THE PRINCIPLES THEREOF RELATING TO CONFLICT OF LAW EXCEPT SECTION
5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW). Whenever possible each
provision of this Agreement shall be interpreted in such manner as to be
effective and valid under applicable law, but if any provision of this Agreement
shall be prohibited by or invalid under applicable law, such

                                       7
<PAGE>

provision shall be ineffective to the extent of such prohibition or invalidity,
without invalidating the remainder of such provision or the remaining provisions
of this Agreement.

                  4.8 Counterparts. This Agreement may be executed in any number
of counterparts, each of which shall, when executed, be deemed to be an original
and all of which taken together shall be deemed to be one and the same
agreement. Delivery of an executed counterpart of a signature page to this
Agreement by telecopier shall be effective as delivery of a manually executed
counterpart of this Agreement.

                  IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed by their officers thereunto duly authorized as of
the day and year first above written.

                            [SIGNATURE PAGES FOLLOW]

                                       8
<PAGE>

                           WILLIAMS COMMUNICATIONS, LLC

                           By:        /s/ Howard S. Kalika
                               -------------------------------------------------
                               Name:  Howard S. Kalika
                               Title: Senior Vice President & Treasurer

                           THE WILLIAMS COMPANIES, INC.

                           By:        /s/ James G. Ivey
                               -------------------------------------------------
                               Name:  James G. Ivey
                               Title: Treasurer

<PAGE>

                           STATE STREET BANK AND TRUST
                           COMPANY OF CONNECTICUT NATIONAL
                           ASSOCIATION, not in its individual capacity but
                           solely as Trustee  of the 1998 WCI Trust, as
                           Trustee and Lessor

                           By:        /s/ Earl W. Dennison, Jr.
                               -------------------------------------------------
                               Name:  Earl W. Dennison, Jr.
                               Title: Vice President

                           STATE STREET BANK AND TRUST
                           COMPANY, not in its individual capacity but
                           solely as Collateral Agent

                           By:        /s/ Earl W. Dennison, Jr.
                               -------------------------------------------------
                               Name:  Earl W. Dennison, Jr.
                               Title: Vice President

<PAGE>

                           CITIBANK, N.A., as Agent

                           By:        /s/ Todd J. Mogil
                               -------------------------------------------------
                               Name:  Todd J. Mogil
                               Title: Attorney-In-Fact

                           CITIBANK, N.A.
                           as APA Purchaser

                           By:        /s/ Todd J. Mogil
                               -------------------------------------------------
                               Name:  Todd J. Mogil
                               Title: Attorney-In-Fact

<PAGE>

                           CXC INCORPORATED

                           By: CITICORP NORTH AMERICA, INC.,
                               as attorney-in-fact

                           By:        /s/ Kimberly A. Conyngham
                               -------------------------------------------------
                               Name:  Kimberly A. Conyngham
                               Title: Vice President

                           CITICORP NORTH AMERICA, INC.,
                             as administrative agent for CXC
                             Incorporated and as RCE Agent

                           By:        /s/ Kimberly A. Conyngham
                               -------------------------------------------------
                               Name:  Kimberly A. Conyngham
                               Title: Vice President

<PAGE>

                           WC NETWORK FUNDING LLC,
                           as Note Holder

                           By:  WC Network Holdings, Inc.,
                                its sole member

                           By:        /s/ Susan C. Ciaramella
                               -------------------------------------------------
                               Name:  Susan C. Ciaramella
                               Title: Vice President

<PAGE>

                           FBTC LEASING CORP.,
                           as Certificate Holder

                           By:        /s/ Victor Mora
                               -------------------------------------------------
                               Name:  Victor Mora
                               Title: Vice President

<PAGE>

                           SCOTIABANC INC.,
                           as Certificate Holder

                           By:        /s/ W. J. Brown
                               -------------------------------------------------
                               Name:  W. J. Brown
                               Title:

                           THE BANK OF NOVA SCOTIA,
                           as APA Purchaser

                           By:        /s/ M. D. Smith
                               -------------------------------------------------
                               Name:  M. D. Smith
                               Title: Agent Operations

<PAGE>

                           BANK OF MONTREAL,
                           as APA Purchaser

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

<PAGE>

                           ROYAL BANK OF CANADA,
                           as APA Purchaser

                           By:        /s/ Tom J. Oberaigner
                               -------------------------------------------------
                               Name:  Tom J. Oberaigner
                               Title: Senior Manager

<PAGE>

                           BANK OF AMERICA, N.A., as APA Purchaser

                           By:        /s/ Claire M. Liu
                               -------------------------------------------------
                               Name:  Claire M. Liu
                               Title: Managing Director

<PAGE>

                           JP MORGAN CHASE BANK (f/k/a The Chase
                           Manhattan Bank), as APA Purchaser

                           By:        /s/ Steven Wood
                               -------------------------------------------------
                               Name:  Steven Wood
                               Title: Vice President

<PAGE>

                           BARCLAYS BANK PLC,
                           as APA Purchaser

                           By:        /s/ Nicholas A. Bell
                               -------------------------------------------------
                               Name:  Nicholas A. Bell
                               Title: Loan Transaction Manager

<PAGE>

                           TORONTO DOMINION (TEXAS), INC.
                           as APA Purchaser

                           By:        /s/ Jill Hall
                               -------------------------------------------------
                               Name:  Jill Hall
                               Title: Vice President

<PAGE>

                           ABN AMRO BANK, N.V.
                           as APA Purchaser

                           By:        /s/ Neil J. Bivona
                               -------------------------------------------------
                               Name:  Neil J. Bivona
                               Title: Group Vice President

                           By:        /s/ William J. Teresky, Jr.
                               -------------------------------------------------
                               Name:  William J. Teresky, Jr.
                               Title: Group Vice President

<PAGE>

                           FLEET NATIONAL BANK (f/k/a BankBoston,
                           N.A.), as APA Purchaser

                           By:        /s/ Daniel S. Schockling
                               -------------------------------------------------
                               Name:  Daniel S. Schockling
                               Title: Director

<PAGE>

                           CIBC INC., as APA Purchaser

                           By:        /s/ Mark H. Wolf
                               -------------------------------------------------
                               Name:  Mark H. Wolf
                               Title: Executive Director

<PAGE>

                           THE BANK OF NEW YORK,
                           as APA Purchaser

                           By:        /s/ Raymond J. Palmer
                               -------------------------------------------------
                               Name:  Raymond J. Palmer
                               Title: Vice President

<PAGE>

                           BNP PARIBAS, as APA Purchaser

                           By:        /s/ Gregg Bonardi
                               -------------------------------------------------
                               Name:  Gregg Bonardi
                               Title: Director, Media & Telecom Finance

                           By:        /s/ Ben Todres
                               -------------------------------------------------
                               Name:  Ben Todres
                               Title: Director, Media & Telecom Finance

<PAGE>

                           COMMERZBANK AG, NEW YORK AND
                           GRAND CAYMAN BRANCHES, as APA
                           Purchaser

                           By:        /s/ Brian J. Campbell
                               -------------------------------------------------
                               Name:  Brian J. Campbell
                               Title: Senior Vice President

                           By:        /s/ D. L. Ward, Jr.
                               -------------------------------------------------
                               Name:  Assistant Vice President
                               Title: Assistant Vice President

<PAGE>

                           CREDIT AGRICOLE INDOUSUEZ,
                           as APA Purchaser

                           By:        /s/ Brian Knezeak
                               -------------------------------------------------
                               Name:  Brian Knezeak
                               Title: First Vice President

                           By:        /s/ Mark Lyoff
                               -------------------------------------------------
                               Name:  Mark Lyoff
                               Title: Head of Energy Platform<PAGE>
                                                                   EXHIBIT 10(t)

                     MEMBERSHIP INTEREST PURCHASE AGREEMENT

         This Membership Interest Purchase Agreement (this "Agreement"), dated
as of September 13, 2001, is by and Williams Communications, LLC, a Delaware
limited liability company ("Seller"), and Williams Aircraft, Inc., a Delaware
corporation ("Buyer").

                                    RECITALS

         Seller is the owner of the entire membership interest of Williams
Communications Aircraft, LLC, a Delaware Limited Liability Company (the
"Company").

         Buyer desires to purchase from Seller, and Seller desires to sell to
Buyer, the entire membership interest in the Company upon the terms and subject
to the conditions contained herein.

         NOW, THEREFORE, in consideration of the premises, agreements and
covenants contained herein, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged and in reliance upon
the mutual representations and warranties contained herein, Seller and Buyer
agree, upon the terms and subject to the conditions contained herein, as
follows:

                                    ARTICLE I

                                PURCHASE AND SALE

         1.01 Transfer of Membership Interest. Upon the terms and subject to the
conditions of this Agreement, at the Closing Date (as hereinafter defined),
Seller agrees to sell, assign and deliver to Buyer the entire membership
interest in the Company (the "Interest") together with all of the rights titles
and interests of Seller in or relating in any way to the Company.

         1.02 Purchase Price. The consideration (the "Purchase Price") for the
Interest shall be the sum of Thirty-One Million U.S. Dollars (US$31,000,000.00)
and the assumption by Buyer of all of the liabilities and obligations relating
to the Interest. On the Closing Date, pursuant to the terms and conditions of
this Agreement, Buyer agrees to wire transfer the Purchase Price to the Seller
in accordance with Seller's instructions.

         1.03 Effective Date. The effective date of the transaction
contemplated by this Agreement shall be the Closing Date (as hereinafter
defined).

                                       1
<PAGE>

                                   ARTICLE II

                                     CLOSING

         2.01 Time and Place of Closing. The closing of the transactions
contemplated hereby (the "Closing") shall be held at the offices of Buyer
located One Williams Center, Tulsa, Oklahoma 74172 , at 1:00 p.m., local time,
on the later to occur of the date which is the first business day following the
day that the conditions specified in Article 5 below shall have been satisfied
in all material respects (or waived by the party or parties entitled to the
benefit thereof), unless another time, date and place is agreed to in writing by
Buyer and Seller. The date upon which Closing occurs shall be referred to herein
as the "Closing Date".

         2.02 Deliveries by Seller. (a) Delivery of Documents. At Closing,
Seller shall deliver to Buyer:

                  (i) One or more certificates evidencing that Buyer is the
owner of the Interest, including without limitation an Assignment of Limited
Liability Membership Interest substantially in the form attached hereto as
Exhibit A; and

                  (ii) A legal opinion as to the title and lien status to the
Aircraft;

                  (iii) All waivers, consents, permissions, or other documents
that may be necessary for the transfer of the Interest to Buyer; and

                  (iv) The duly executed Aircraft Dry Leases for the Aircraft
and Releases of all liens on the Aircraft.

         2.03 Deliveries By Buyer. At Closing, Buyer shall deliver the
consideration described in Article 1.02 to Seller together with evidence of
Buyer's power and authority to purchase the Interest.

                                   ARTICLE III

                    REPRESENTATIONS AND WARRANTIES OF SELLER

         Seller represents and warrants to Buyer as follows:

         3.01 Existence and Qualification. The Company is a limited liability
company duly formed and validly existing under the laws of Delaware. The Company
has all requisite corporate power and authority to own, operate and lease its
properties and to carry on its business as presently conducted. All of the
minute books, including all minutes, consents and other records of actions taken
by the members and managers (including any committee thereof) of the Company are
held by the Company.

                                       2
<PAGE>

         3.02 Authority, Approval and Enforceability. Seller has all requisite
power and authority to execute and deliver this Agreement and to perform its
obligations under this Agreement. This Agreement has been duly executed and
delivered on behalf of Seller and constitutes the legal, valid and binding
obligation of Seller, enforceable against Seller in accordance with its terms.
At the Closing all documents required hereunder to be executed and delivered by
Seller will have been duly authorized, executed and delivered by Seller and will
constitute legal, valid and binding obligations of Seller, enforceable in
accordance with their terms.

         3.03 The Interest. The Interest is the sole membership interest in the
Company and is owned beneficially and in the name of Seller, free and clear of
all mortgages, pledges, security interests, liens or encumbrances of any kind
and is not subject to any agreements or understandings among any persons with
respect to the voting or transfer thereof. There are no outstanding
subscriptions, options, convertible securities, warrants, calls or other
securities granting rights to purchase or otherwise acquire interests in the
Company or any commitments or agreements of any character obligating Seller
regarding the foregoing.

         3.04 Governmental Authorizations. The Seller has obtained and holds
all governmental permits, licenses, orders and approvals necessary to own the
Interest.

         3.05 Assets. The only assets of the Company are the Aircraft as
described in Article 5.01, and the Company has no liabilities, obligations,
commitments or undertakings except as regards the ongoing ownership and
operation of the Aircraft. All filings and certificates necessary for the
Company to own and operate the Aircraft have been filed or obtained.

         3.06 Airworthiness. At Closing the Aircraft shall be in an airworthy
condition with all systems functioning within tolerances as stated in the
manufacturer's maintenance criteria. The Aircraft are and shall be at Closing
free and clear of all liens and encumbrances, and the Company will have good and
marketable title thereto. Seller has previously delivered to the Company a
Certificate of Airworthiness issued by the U.S. Federal Aviation Administration
("FAA") certifying that, at the date of issuance, the Aircraft has been
inspected and found to conform in all respects to the applicable FAA Certificate
of Airworthiness.

                                   ARTICLE IV

                              CONDITIONS TO CLOSING

         4.01 Conditions to Obligations of Buyer and Seller. The obligations of
Buyer and Seller to proceed with the Closing are subject to the satisfaction at
or prior to Closing of all of the following conditions.

                                       3
<PAGE>

                  (a) Compliance. Buyer and Seller shall have complied in all
material respects with their respective covenants and agreements contained
herein. The representations and warranties contained herein, or in any
certificate or similar instrument required to be delivered by or on behalf of
each of Seller or Buyer pursuant hereto shall be true and correct in all
material respects on and as of the Closing Date, with the same effect as though
made at such time;

                  (b) No Orders. No order, writ, injunction or decree shall have
been entered and be in effect by any court of competent jurisdiction or any
governmental or regulatory instrumentality or authority, and no statute, rule,
regulation or other requirement shall have been promulgated or enacted and be in
effect, that restrains, enjoins or invalidates the transactions contemplated
hereby;

                  (c) No Suits. No suit or other proceeding shall be pending or
threatened by any third party before any court or governmental agency seeking to
restrain or prohibit or declare illegal, or seeking substantial damages in
connection with, the transactions contemplated by this Agreement.

                                    ARTICLE V

                                     ASSETS

         5.01 Asset. The only assets or property of any kind owned by the
Company are the Aircraft identified on Exhibit "B". All of the above, together
with the existing components, avionics, accessories, equipment attached or
unattached, instrumentation and log books, including without limitation the
specifications and features set forth in Exhibit B hereto, are collectively
referred to herein as the "Aircraft".

                                   ARTICLE VI

                             POST CLOSING INSPECTION

         6.01 Inspection of the Aircraft. On a date that is mutually agreed
between Buyer and Seller, but not later than October 31, 2001, Seller will
present the Aircraft for inspection to Buyer, or Buyers designated
representative. The location of such presentation for inspection shall be the
Buyer's hangar located at Tulsa International Airport, Tulsa, Oklahoma, and the
direct cost of presenting the Aircraft for inspection shall be borne by the
Seller. The cost of the inspection shall be borne by Seller. Upon such
presentation of the Aircraft for inspection by Seller, Buyer shall have the
right for a period of up to seven (7) days to inspect the Aircraft, to conduct a
test flight under the supervision and control of Seller, and to review all
maintenance records, all flight and other records and to otherwise conduct such
physical, technical, engineering and mechanical reviews and tests as would a
normal prudent purchaser of similar aircraft. Within two (2) business days
following the end of such seven (7) day period, Buyer or its representative
shall deliver to Seller a detailed list of any defects (whether physical,
mechanical or otherwise) that Buyer requires to be remedied as a condition of
completing the purchase of the Interest. Seller shall have fifteen (15) days
following

                                       4
<PAGE>

the receipt of such notice to either (i) remedy defects affecting
airworthiness of the Aircraft to the reasonable satisfaction of Buyer, or (ii)
agree to pay Buyer an amount that the parties agree is the projected cost of
remedying such defects affecting the airworthiness of the Aircraft. In the event
that Seller undertakes to remedy any defects notified by Buyer, Buyer shall have
a reasonable period thereafter to conduct such further tests of the Aircraft to
confirm the completion of any repairs made by Seller as provided above. Defects
not affecting the airworthiness of the Aircraft shall be itemized and, subject
to mutual agreement by the parties, the Seller shall pay Buyer the reasonable
cost of such repairs. Notwithstanding the above, any Defects existing on or
prior to February 26, 2001, shall not be subject to this Section. Buyer and
Seller shall coordinate on any such preexisting defects.

         6.02 All flight manuals, maintenance manuals, parts catalogs, wiring
diagrams as well as all other records, paperwork, or minor equipment as is
normally considered to be part of the Aircraft will be given to Buyer at closing
or at a later time consented to in writing by the Buyer.

                                   ARTICLE VI

                                  MISCELLANEOUS

         7.01 Notices. Any notice, request, instruction, correspondence or other
communication to be given or made hereunder by either party to the other (herein
collectively called "Notice") shall be in writing and (a) delivered by hand, (b)
mailed by certified mail, postage prepaid and return receipt requested, (c) sent
by telecopier, or (d) sent by Express Mail, Federal Express, or other express
delivery service.

         7.02 Governing Law. The provisions of this agreement, the schedules
hereto, and the documents delivered pursuant hereto shall be governed by and
construed in accordance with the laws of the State of Oklahoma (excluding any
conflicts-of-law rule or principle that might refer such matters to the laws of
another jurisdiction), except to the extent that such matters are mandatorily
subject to the laws of another jurisdiction pursuant to the laws of such other
jurisdiction.

         7.03 Entire Agreement; Amendments and Waivers. This Agreement, together
with all Schedules hereto, constitutes the entire agreement between the parties
hereto pertaining to the subject matter hereof and supersedes all prior
agreements, understandings, negotiations and discussions, whether oral or
written, of the parties regarding the Interest or the Aircraft. No supplement,
modification or waiver of this Agreement shall be binding unless executed in
writing by the party to be bound thereby. No waiver of any of the provisions of
this Agreement shall be deemed or shall constitute a waiver of any other
provision hereof (regardless of whether similar), nor shall any such waiver
constitute a continuing waiver unless otherwise expressly provided.

         7.04 Binding Effect and Assignment. This Agreement shall be binding
upon and inure to the benefit of the parties hereto and their respective
permitted successors and assigns. Neither this

                                       5
<PAGE>

Agreement nor any of the rights, benefits or obligations hereunder shall be
assigned, by operation of law or otherwise, by any party hereto prior to the
Closing without the prior written consent of the other party. Except as
expressly provided herein, nothing in this Agreement is intended to confer upon
any Person other than the parties hereto and their respective permitted
successors and assigns, any rights, benefits or obligations hereunder.

         7.05 Severability. If any one or more of the provisions contained in
this Agreement or in any other document delivered pursuant hereto shall, for any
reason, be held to be invalid, illegal or unenforceable in any material respect,
such invalidity, illegality or unenforceability shall not affect any other
provision of this Agreement or any other such document.

         7.06 No Implied Warranty on Aircraft. BUYER UNDERSTANDS THAT THE
AIRCRAFT WAS ACQUIRED BY THE COMPANY FROM SELLER ON AN "AS IS" CONDITION. UNLESS
OTHERWISE PROHIBITED BY LAW, BUYER AGREES THAT (i) SELLER MAKES NO WARRANTIES,
EXPRESSED OR IMPLIED WITH RESPECT TO THE AIRCRAFT THAT CONTINUE BEYOND THE
CLOSING, EXCEPT THAT SELLER WARRANTS THAT THE COMPANY HAS GOOD AND MARKETABLE
TITLE TO THE AIRCRAFT AND THE AIRCRAFT WAS ACQUIRED BY THE COMPANY FROM SELLER
WITH A FAA 8050-2 BILL OF SALE, FREE AND CLEAR OF ALL LIENS, (ii) BUYER WAIVES
AS TO SELLER ALL OTHER WARRANTIES RELATING TO THE AIRCRAFT, WHETHER OF
MERCHANTABILITY, FITNESS OR OTHERWISE, (iii) SELLER DISCLAIMS ALL LEGAL
RESPONSIBILITY FOR PRODUCT DEFECTS RELATING TO THE AIRCRAFT THAT MIGHT CAUSE
HARM, (iv) SELLER SHALL NOT BE LIABLE FOR ANY GENERAL, CONSEQUENTIAL OR
INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, ANY DAMAGES FOR LOSS OF USE,
LOSS OF PROFITS OR DIMINUTION OF MARKET VALUE OF THE AIRCRAFT, AND SELLER SHALL
NOT BE LIABLE FOR ANY DAMAGES CLAIMED BY BUYER OR ANY OTHER PERSON OR ENTITY
UPON THE THEORIES OF NEGLIGENCE OR STRICT LIABILITY IN TORT, (v) IF THE AIRCRAFT
SHOULD FOR ANY REASON PROVE TO BE DEFECTIVE, SELLER AND COMPANY BEAR NO
OBLIGATION FOR SERVICING AND REPAIR OF SUCH DEFECT(S), AND (vi) ALL RISK AS TO
THE QUALITY AND PERFORMANCE OF THE AIRCRAFT IS THAT OF THE COMPANY. Upon
Delivery the Seller shall deliver to the Company an assignment of all
manufacturer's warranties, if any, with respect to the Aircraft that are
assignable (other than those warranties which by their terms are not
assignable). Seller shall also, upon Buyer's request, reasonably execute, or
cause to be executed such further documents as may be necessary to assist the
Company to maintain continuity of the warranties and to assist the Company to
process warranty claims directly with the manufacturers. All costs, if any, to
transfer said manufacturer's warranties shall be at Buyer's expense.

         7.07 Headings and Schedules. The headings of the several Articles and
Sections herein are inserted for convenience of reference only and are not
intended to be a part of or to affect the

                                       6
<PAGE>

meaning or interpretation of this Agreement. The Schedules referred to herein
are attached hereto and incorporated herein by this reference. Seller may revise
or supplement the Schedules at any time prior to Closing.

         7.08 Further Assurances. After the Closing, Seller and Buyer will take
all appropriate action and execute any documents, instruments or conveyances of
any kind that may be reasonably necessary to effectuate the intent of this
Agreement.

         7.09 Taxes. Seller hereby agrees to pay, and indemnify and hold
harmless the Buyer from and against, any and all taxes (including interest and
penalties), duties and fees assessed or levied by any federal, state or local
taxing authority as a result of this Agreement or the sale, delivery,
registration or ownership of the Aircraft by the Company. Seller shall not,
however, be liable for any tax imposed with respect to, or measured by, the net
income of the Buyer.

         7.10 Confidentiality. The terms and conditions of this offer shall
remain confidential. Seller and Buyer agree to not divulge any terms and/or
conditions contained herein prior to, or subsequent to delivery, with the
exception of filings with federal or state agencies.

         7.12 Counterparts and Binding Effect. This Agreement may be executed in
counterparts and each counterpart shall be an original, and all counterparts
together shall be one and the same. This Agreement shall be binding and
enforceable against, and run to the benefit of, the successors and assigns of
the parties hereto.

[Signature page follows]

                                       7
<PAGE>

EXECUTED as of the date first set forth above.

SELLER:

WILLIAMS COMMUNICATIONS, LLC

By:     /s/   Howard S. Kalika
     ------------------------------------------------
Name:         Howard S. Kalika
       ----------------------------------------------
Title:        Treasurer and Vice President
        ---------------------------------------------

BUYER:

WILLIAMS AIRCRAFT, INC.

By:     /s/  Mark W. Husband
     ------------------------------------------------
Name:        Mark W. Husband
       ----------------------------------------------
Title:       Assistant Treasurer
        ---------------------------------------------

              Signature Page to that certain Membership  Interest
            Purchase Agreement between Williams Communications, LLC
                          and Williams Aircraft, Inc.

                                       8
<PAGE>

                                    EXHIBIT A

           ASSIGNMENT OF LIMITED LIABILITY COMPANY MEMBERSHIP INTEREST

THIS ASSIGNMENT OF LIMITED LIABILITY COMPANY MEMBERSHIP INTEREST (this
"Assignment"), dated effective as of September 13, 2001, is WILLIAMS
COMMUNICATIONS LLC, a Delaware limited liability company ("Assignor"), WILLIAMS
AIRCRAFT, INC., a Delaware corporation ("Assignee").

                                    Recitals

A.       Assignor is the owner of the entire membership interest in Williams
Communications Aircraft, LLC, a Delaware limited liability company (the
"Company").

B.       Assignor has agreed to assign to Assignee all of its interest in the
Company and Assignee has agreed to accept such assignment.

                            Assignment and Assumption

For $10 and other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, Assignor and Assignee agree as follows:

1.      Assignor hereby transfers, grants, contributes, conveys and assigns to
Assignee all of its ownership rights, titles and interests in and to the
Company, including but not limited to all of Assignor's membership interest in
the Company (collectively, the "Assigned Interests").

2.       Assignee hereby assumes all liabilities and obligations accruing with
respect to the Assigned Interests from and after September 13, 2001.

3.      Assignor will, upon request from Assignee, execute and deliver any
additional documents necessary to complete the sale, assignment and transfer of
the Assigned Interests tendered hereby. Assignor authorizes the Company to
transfer ownership of the Assigned Interests to Assignee on the books and
records of the Company.

4.       This Assignment shall be binding upon, and shall inure to the benefit
of the parties hereto and their successors, heirs and assigns.

5.       This Assignment shall be governed by the laws of the State of Oklahoma,
without regard for its conflict of laws rules.

                                       9
<PAGE>

6.       This Assignment may be executed in counterparts, each of which shall be
deemed an original, but all of which together shall constitute one and the same
document.

EXECUTED to be effective as of the date first set forth above.

ASSIGNOR:

WILLIAMS COMMUNICATIONS, LLC

By:      /s/  Howard S. Kalika
     ------------------------------------------------

Name:         Howard S. Kalika
         --------------------------------------------

Title:        Treasurer and Vice President
         --------------------------------------------

ASSIGNEE:

WILLIAMS AIRCRAFT, INC.

By:      /s/  Mark W. Husband
     ------------------------------------------------

Name:         Mark W. Husband
       ----------------------------------------------

Title:        Assistant Treasurer
        ---------------------------------------------

                                       10
<PAGE>

                                    EXHIBIT B

                     DESCRIPTION OF AIRCRAFT SPECIFICATIONS

         1.       CESSNA MODEL 560 CITATION V AIRCRAFT WITH MANUFACTURER'S
                  SERIAL NUMBER 560-0194 AND UNITED STATES NATIONALITY AND
                  REGISTRATION MARKS N352WC.

                  PRATT & WHITNEY MODEL JT15D-5D AIRCRAFT ENGINES WITH
                  MANUFACTURER'S SERIAL NUMBERS PCE-108400 AND PCE-108397.

                  SUCH AIRCRAFT TO BE BASED AT TULSA INTERNATIONAL AIRPORT, CITY
                  OF TULSA, OKLAHOMA, COUNTRY OF U.S.A.

         2.       CESSNA MODEL 750 CITATION X AIRCRAFT WITH MANUFACTURER'S
                  SERIAL NUMBER 750-0121 AND UNITED STATES NATIONALITY AND
                  REGISTRATION MARKS N358WC.

                  ALLISON MODEL AE3007C AIRCRAFT ENGINES WITH MANUFACTURER'S
                  SERIAL NUMBERS CAE330260 AND CAE330261.

                  SUCH AIRCRAFT TO BE BASED AT TULSA INTERNATIONAL AIRPORT, CITY
                  OF TULSA, OKLAHOMA, COUNTRY OF U.S.A.

         3.       CESSNA MODEL 560XL CITATION EXCEL AIRCRAFT WITH MANUFACTURER'S
                  SERIAL NUMBER 560-5129 AND UNITED STATES NATIONALITY AND
                  REGISTRATION MARKS N359WC.

                  PRATT & WHITNEY MODEL PW545A AIRCRAFT ENGINES WITH
                  MANUFACTURER'S SERIAL NUMBERS PCEDB0271 AND PCEDB0265.

                  SUCH AIRCRAFT TO BE BASED AT SPIRIT OF SAINT LOUIS AIRPORT,
                  CITY OF CHESTERFIELD, MISSOURI, COUNTRY OF U.S.A.

                                       11

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