Document:

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                                                                   Exhibit 10.89

                            RW ACQUISITION, L.L.C.
                       1010 North Glebe Road, Suite 800
                          Arlington, Virginia  22201

                                                                    June 2, 2000

          Robert J. Galle
          Chief Executive Officer
          Airadigm Communications, Inc.
          PO Box 206
          Little Chute, WI  54140

          Re:  Working Capital Financing

          Dear Bob:

          This letter relates to the Asset Purchase Agreement (the "Agreement"),
          as supplemented, dated June 2, 2000, between Airadigm Communications,
          Inc. ("Airadigm" or "Debtor") and RW Acquisition, L.L.C. ("RW" or the
          "Buyer"), contemplating the acquisition (the "Transaction") of
          substantially all of Airadigm's assets.

          The Agreement provides in Section 2.4 that RW intends to provide, or
          cause its designee to provide, Airadigm with a working capital loan
          (the "Working Capital Loan"). References in this letter to RW may be
          deemed to refer to RW's designee, but RW will remain liable for all
          obligations hereunder. This letter of intent ("Working Capital LOI")
          sets forth our understanding concerning the terms and conditions upon
          which RW will provide the Working Capital Loan, and will serve as the
          basis for the preparation of a definitive agreement.

          The principal terms of our agreement are as follows:

               1.  Amount of Advances. Commencing on the later of June 1, 2000
                   ------------------
          and the date of receipt of any necessary court approval, and
          continuing on the first of each succeeding month until RW's obligation
          to make Advances has terminated pursuant to Section 2 below (the
          "Termination of Advances"), RW will advance to Airadigm the sum of six
          hundred thousand dollars ($600,000) (subject to increase pursuant to
          section 4 of the Construction Management Agreement entered into
          concurrently herewith between Airadigm and
<PAGE>

          Robert J. Galle
          June 6, 2000
          Page 2

          TeleCorp Communications, Inc.) in immediately available funds (the
          "Advances") to be used to meet Airadigm's working capital needs in
          accordance with the budget attached hereto as Exhibit A and made a
          part hereof (the "Budget"). Airadigm shall provide RW with updates of
          the Budget each week during the term of this Agreement. Airadigm shall
          not make expenditures in excess of the amounts set forth in the Budget
          without the prior written consent of RW. To the extent that Airadigm
          proposes working capital requirements in any month in excess of
          $600,000, RW shall have the right to direct where the proceeds of the
          Working Capital Loan shall be applied.

               2.  Termination of Advances. RW shall continue to make Advances
                   -----------------------
          until the earlier of (i) the closing of the Transaction, (ii) the
          termination of the Agreement as provided for therein, or (iii)
          delivery by one party to the other of a notice that the advances will
          cease (a "Cessation Notice"). A Cessation Notice may be delivered by
          either party to the other at any time if the FCC denies or dismisses
          the FCC Petition. A Cessation Notice may be delivered by RW to
          Airadigm at any time (i) after four Advances have been made, if the
          FCC has not by the date of such notice granted or denied or dismissed
          the FCC Petition, (ii) if Airadigm terminates the management agreement
          entered into between Airadigm and an affiliate of RW concurrently
          herewith pursuant to section 3(c) thereof, or (iii) if Airadigm makes
          expenditures in excess of the amounts set forth in the Budget without
          the prior written consent of RW.

               3.  Use of Proceeds. The Working Capital Loan proceeds shall be
                   ---------------
          used only to pay ordinary and reasonable working capital requirements,
          consistent with prior practice and in accordance with the Budget.

               4.  Interest Rate. Interest shall accrue on the unpaid principal
                   -------------
          balance at a rate per annum equal to eleven percent (11%). Interest
          shall be calculated on the basis of actual days elapsed, and shall
          accrue quarterly, commencing on July 3, 2000, and continuing on the
          first business day of each succeeding October, January, April and July
          thereafter.

               5.  Payments. No payments shall be due until maturity. Interest
                   --------
          shall be added to the principal amount on the date that it accrues.

               6.  Maturity Date. The principal amount of the Working Capital
                   -------------
          Loan and accrued but unpaid interest thereon shall be due and payable
          in full on the earlier of: (i) the closing of the Transaction, (ii)
          180 days after the Termination of Advances.
<PAGE>

          Robert J. Galle
          June 6, 2000
          Page 3

               7.  Collateral. The Collateral shall be the same property, assets
                   ----------
          and interests identified as collateral under the Debtor-in-Possession
          Loan provided by Ericsson to Airadigm (the "Ericsson DIP").

               8.  Lien Priority; Subordination. RW's security interest shall be
                   ----------------------------
          a lien junior in priority only to the lien created by the Ericsson DIP
          and to the prepetition liens of Ericsson and OEDA; provided, however,
          that Ericsson and OEDA shall agree to subordinate their right of
          payment under the Ericsson DIP in favor of RW for repayment of the
          Working Capital Loan under all circumstances, including but not
          limited to upon liquidation. In addition, pursuant to 11 U.S.C.
          Sections 364(c)(1) and 507(b), the Working Capital Loan shall have
          priority over all other administrative expenses except Chapter 11
          attorney's fees and Chapter 11 employee claims up to an aggregate
          amount equal to $500,000, but including those that may be incurred in
          a subsequent Chapter 7 case; provided, however, that RW's
          superpriority administrative claim hereunder shall be pari passu with
          the superpriority administrative claim created pursuant to the
          Ericsson DIP. RW's Collateral shall be protected against any surcharge
          under 11 U.S.C. Section 506(c), without the express written consent of
          the Buyer.

               9.  Conditions Precedent. RW's provision of the Working Capital
                   --------------------
          Loan shall be subject to the following:

               9.1  Airadigm and RW shall have executed the Agreement.

               9.2  Airadigm and RW shall have executed a definitive Debtor-In-
               Possession Loan Agreement and related documentation that shall
               embody the terms set forth herein and contain customary
               representations, warranties, covenants and conditions such as
               those contained in the Ericsson DIP.

               9.3  The Bankruptcy Court shall have approved the Working Capital
               LOI without material modification and authorized Airadigm to make
               the borrowings contemplated by its terms.

               10. Defaults. In addition to the customary default provisions,
                   --------
          the Working Capital Loan shall be in default if Airadigm shall file an
          application for assignment or transfer of control of its business or
          its licenses other than as provided in the Plan or if the Agreement is
          terminated due to a breach by Airadigm.
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          Robert J. Galle
          June 6, 2000
          Page 4

               11.  Governing Law. To the extent the matter set forth in this
                    -------------
          Working Capital LOI is governed by state law, it shall be governed by
          and shall be construed in accordance with the laws of the State of New
          York, without reference to choice of law provisions thereof. The
          parties hereto submit to the jurisdiction of the Bankruptcy Court in
          which Airadigm's Chapter 11 case is currently pending.

               12.  Letter of intent. Airadigm and RW recognize that Airadigm
                    ----------------
          cannot enter into a binding agreement for Debtor-In-Possession
          financing without Court approval and that this Working Capital LOI and
          the transaction and documentation contemplated by it is subject to and
          contingent on Bankruptcy Court approval. Airadigm and RW covenant and
          agree that they shall use all commercially reasonable efforts to
          obtain court approval of the terms and conditions of this Working
          Capital LOI, making such non-material modifications as the Court may
          require in an effort to preserve the bargain intended to be struck by
          the parties.

               13.  Counterparts. This Working Capital LOI may be executed in
                    ------------
          any number of counterparts, each of which when so executed and
          delivered shall be an original, but all of which shall together
          constitute one in the same instrument. Facsimile signatures are
          acceptable.

               14.  Notices. Notices shall be given to the same parties as
                    -------
          identified in Section 10.3 of the Agreement.

          If the foregoing accurately sets forth our understanding, we request
          that you evidence your approval by signing the copy of this letter and
          returning it to the undersigned.
<PAGE>

          Robert J. Galle
          June 6, 2000
          Page 4

          Sincerely,

          RW ACQUISITION, L.L.C.

          By
             ---------------------------

          Its
              --------------------------

          ACCEPTED AND AGREED TO this _____ of May, 2000.

          AIRADIGM COMMUNICATIONS, INC.

          By
             ---------------------------

          Its
              --------------------------<PAGE>

                                                                   Exhibit 10.90

                       CONSTRUCTION MANAGEMENT AGREEMENT
                       ---------------------------------

     THIS CONSTRUCTION MANAGEMENT AGREEMENT ("Agreement") is made as of June
                                              ---------
2, 2000 by and between TeleCorp Communications, Inc., a Delaware corporation
("Manager"), and Airadigm Communications, Inc., a Wisconsin corporation (the
"Company") (Manager and the Company are collectively referred to as the
"Parties").

                                    RECITALS
                                    --------

     WHEREAS, the Company has been granted the personal communications services
licenses described on Exhibit A (the "Licenses"), which, the Parties
                      ---------
acknowledge,  the FCC has taken the position have automatically cancelled;

     WHEREAS, RW Acquisitions, L.L.C. (an affiliate of Manager)("RWA") has
agreed to purchase from the Company, and the Company has agreed to sell to RWA,
substantially all of the Company's assets under the terms of either: (i) that
certain Asset Purchase Agreement dated as of June 2, 2000 (the "Purchase
Agreement"); or alternatively, (ii) that certain Contingent Supplement to Asset
Purchase Agreement dated June 2, 2000 (the "Contingent Purchase Agreement");

     WHEREAS, RWA has agreed to provide the Company with a working capital loan
upon the terms and conditions set forth in that certain Letter of Intent
executed by RWA and the Company, dated June 2, 2000 (the "Working Capital
Loan"); and

     WHEREAS, the Parties desire to enter into this Agreement in order for
Manager to effect the implementation and management of the conversion of the
Company's personal communications services network (both before and after
Conversion, the "PCS System") from a GSM technology-based system to a TDMA
technology-based system (the "Conversion"), with the express understanding that,
during the Conversion, the Company's operations shall remain under the ultimate
supervision, authority and control of the Company and that the Conversion shall
be effected in a manner reasonably calculated to provide seamless service to the
Company's customers and to maintain continuity of service.

     NOW, THEREFORE, in consideration of the foregoing recitals and the mutual
covenants contained herein, it is hereby agreed between the Parties as follows:

     1.  Recitations True. The Parties agree that the aforesaid recitations
         ----------------
accurately reflect the context in which this Agreement is made and entered into.

     2.  Definitions. The definitions set forth in the Purchase Agreement are
         -----------
hereby incorporated by reference and shall apply to this Agreement.
<PAGE>

     3.  Term. This Agreement shall become effective as of the date hereof.
         ----
Unless otherwise terminated pursuant to Section 8(b), this Agreement shall
terminate upon the earliest of:

          (a)  the closing of the transactions contemplated by the Purchase
Agreement or the Contingent Purchase Agreement, as the same may be amended from
time to time;

          (b)  immediately upon the termination of both the Purchase Agreement
and the Contingent Purchase Agreement;

          (c)  thirty (30) days following written notice by one Party to the
other; and

          (d)  immediately upon notice from Manager upon the occurrence of an
"Event of Default" by the Company, where an Event of Default shall be deemed to
have occurred if

               (i)  the Company does not reasonably accept Manager's
recommendations under Section 4(b) or (c) below, or

               (ii) the Company fails to comply with its obligations under
Section 5(b) or (c) below

and in either event such failure has not been cured by the Company within three
business days of receipt of notice of such failure from Manager

     4.  Obligations of Manager. Manager shall have the right to take any and
         ----------------------
all actions on behalf of the Company in order to effect the Conversion,
including providing management and oversight of the Company's and Manager's
personnel and procedures necessary and sufficient to accomplish the Conversion,
as appropriate in Manager's reasonable discretion. Manager's actions shall be in
compliance with all applicable federal, state and local laws, rules and
regulations, including FCC rules and regulations regarding construction,
maintenance and operation of the PCS System. Manager will implement the
Conversion in a fashion designed to be as seamless as possible to Airadigm's
customers and to ensure the continuity of service to Airadigm's customers.

     More specifically, in order to effect the Conversion, Manager will also
have the authority, as appropriate and necessary to implement the Conversion,
to:

          (a)  enter onto any real property in which the Company has an interest
as an invitee, licensee or contractor of the Company and install TDMA equipment
owned by either the Company or Manager and, where necessary in order to locate
the TDMA equipment in the first priority position, to manipulate, disassemble,
remove or relocate the Company's GSM equipment;

          (b)  recruit, train, supervise and direct those employees of the
Company, other than Robert Galle, involved in the Conversion, and recommend to
the Company the employment and discharge by the Company of employees involved in
the Conversion; and

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<PAGE>

          (c)  negotiate, compromise, terminate, revise, restate, or otherwise
address any contracts, agreements or obligations of the Company or Manager in
order to effect the Conversion, and recommend to the Company such contracts,
agreements or obligations for execution or termination.

     Manager shall own or lease all equipment and other tangible assets used in
connection with the Conversion other than assets owned or leased directly by the
Company (the "Tangible Assets").  Upon termination of this Agreement, Manager
shall have the right to enter the Company's premises to remove the Tangible
Assets and the Company shall not have or assert any contractual or other rights
to own or use the Tangible Assets.  Manager shall fund all other costs and
expenses directly related to the Conversion and approved by Manager through
causing RWA to increase the amount of the Working Capital Loan (in addition to
the $600,000 monthly advances made thereunder).

     Notwithstanding the foregoing, Manager will not be required to build any
redundant facilities within the Company's PCS System to accomplish the
Conversion.

     5.  Obligations of the Company.
         --------------------------

          (a)  During the term of this Agreement, the Company shall remain
solely responsible for the timely payment of all operating expenses necessary
for the continued operation of the PCS System in the ordinary course of
business. Such operating expenses shall include, but not be limited to, all
obligations with respect to (i) any claims, third-party liabilities, taxes,
governmental charges, or penalties imposed upon the Company in connection with
the operation of the PCS System; (ii) all salaries, commissions, benefits and
other related costs for all personnel involved in the operation of the PCS
System, with the exception of any employees of Manager; (iii) all lease payments
in connection with real property and equipment leased by the Company; (iv)
maintenance and repair expenses of the PCS System; (v) liability and property
insurance; and (vi) software maintenance agreements.

          (b)  The Company shall submit to Manager all information reasonably
necessary for Manager to provide the services required under the terms of this
Agreement, including without limitation providing Manager access to the
Company's records and customer list.

          (c)  The Company shall cooperate with and assist the Manager in its
performance of the Conversion, including, without limitation: (i) making
available first priority tower and equipment space at each of the Company's PCS
Sites to accommodate the TDMA antennas and equipment to be installed; and (ii)
assisting Manager in the distribution of handsets to the Company's existing
customers that are compatible with the interim system available during
implementation of the Conversion, commencing no earlier than four months after
the date of execution of the Purchase Agreement. The Company will execute such
contracts or modifications thereof, negotiated by Manager pursuant to Section
4(c) above, as are reasonably acceptable to the Company.

     6.  Retention of Control. Notwithstanding any other provision of this
         --------------------
Agreement, the Company shall retain control over the PCS System and shall carry
out all policy decisions with

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<PAGE>

respect thereto. Such control shall include, but not be limited to (i) the
unfettered right to the use of the Company's facilities and equipment; (ii)
control over the day-to-day operations of the PCS System; (iii) control over
policy decisions relating to the operation of the PCS System; (iv) ultimate
responsibility for employment and personnel decisions associated with the
operation of the PCS System; (v) control over financial obligations relating to
the facilities; and (vi) actual receipt of the monies and profits accruing from
the operation of the PCS System.

     7.  Compensation. In consideration for the services to be performed under
         ------------
this Agreement, and if, and only if, this Agreement is terminated by the Company
pursuant to Section 3(c), the Company agrees to pay a fee equal to 10% of the
value of the Tangible Assets provided by Manager through the date of
termination. All fees payable pursuant to this Agreement shall be paid within
ten (10) days following termination of this Agreement.

     8.  Public Regulation.
         -----------------

          (a)  This Agreement is subject to all of the terms and conditions of
all of the Company's Licenses as well as all other outstanding licenses,
applications and authorizations from the FCC and other federal, state and local
government agencies with respect to the PCS System. Nothing in this Agreement
shall be construed so as to impair or diminish the Company's control of the PCS
System or the Licenses.

          (b)  In the event that a federal, state or local government authority
(including, without limitation, the FCC) orders, takes, threatens, or announces
other action which could require the modification or termination of this
Agreement or the relationship between the Parties hereto (i) the Parties may
seek administrative or judicial relief from such order(s) (in which event the
Parties shall cooperate with each other); or (ii) the Parties may consult with
the FCC and its staff, or such other government agency, concerning such matters
and negotiate in good faith a modification to this Agreement which would obviate
any such questions while preserving, to the maximum extent possible, the intent
of the Parties and the economic and other benefits of this Agreement and the
portion hereof whose validity is called into question.

     9.  Relationship of Parties. Neither Party shall hold Manager out as the
         -----------------------
holder of the Licenses or owner of the PCS System.

     10. Notices. All notices to be given by the Parties under this Agreement
         -------
shall given be in accordance with the terms of the Purchase Agreement, except
that all such notices shall be sent to Manager at the following
address/facsimile number:

     TeleCorp Communications, Inc.
     1010 North Glebe Road, Suite 800
     Arlington, Virginia  22201
     Attn: Thomas H. Sullivan
     Fax: 703-236-1376

     11.  Binding Effect. This Agreement shall be binding upon and inure to the
          --------------
benefit of the Parties, their permitted successors and assigns.

                                       4
<PAGE>

     12.  Representations And Warranties. Each Party represents that it is
          ------------------------------
legally qualified, empowered and able to enter into this Agreement and that the
execution, delivery and performance hereof shall not constitute a breach or
violation of any agreement, contract or other undertaking to which such Party is
subject or by which it is bound, other than approval of the Bankruptcy Court.
Each Party hereto represents and warrants that it has taken all necessary
corporate and other necessary action to make this Agreement legally binding on
such Party (other than Bankruptcy Court approval, which the Parties agree to
seek in timely fashion) and that the individual signing this Agreement on behalf
of such Party has been fully authorized and empowered to execute this Agreement
on behalf of such Party.

     13.  Entire Agreement. This Agreement, the Purchase Agreement and the
          ----------------
Contingent Purchase Agreement constitute the entire agreement between the
Parties with respect to the management of the Conversion, and supersede any
prior agreements between the Parties with respect to the matters provided for
herein.

     14.  Construction. This Agreement shall be construed in accordance with the
          ------------
laws of the state of New York except for the choice of law rules utilized in
that state, and the obligations of the Parties hereto are subject to all
federal, state and local laws and regulations now or hereafter in force and the
rules, regulations and policies of the FCC and all other government entities or
authorities presently or hereafter to be constituted. In the event of any
conflict between the terms of this Agreement and the Purchase Agreement, the
terms of the Purchase Agreement shall prevail.

     15.  Counterparts. This Agreement may be executed in counterparts.
          ------------

     IN WITNESS WHEREOF, each party, intending hereby to be bound, has caused
this Construction Management Agreement to be executed:

"Manager"                                      TELECORP COMMUNICATIONS, INC.

                                               By:___________________________
                                               Its:__________________________

"The Company"                                  AIRADIGM, INC.

                                               By:___________________________
                                               Its:__________________________

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