<PAGE>   1
                                                                   EXHIBIT 10.48


                           JOINT OWNERSHIP AGREEMENT


         This Joint Ownership Agreement, is made and entered into as of 12/8,
1998, by and between the parties listed as Co-Owners on Exhibit A, attached
hereto, (collectively referred to herein as the "Co-Owners"), and ITC Service
Company ("ITC"), as Agent.

                                  WITNESSETH:

         WHEREAS, the Co-Owners are the registered joint owners of the following
civil aircraft, hereinafter "Aircraft:"

                A. Beechcraft King Air B200 bearing manufacturer Serial No.
                   BB1439 and Federal Aviation Administration Registration
                   No. N583AT; and

                B. Beech Jet 400A bearing manufacturer Serial No. RK-157 and
                   Federal Aviation Administration Registration No. N397AT.

             and intend to own and operate the Aircraft as tenants-in-common;

         WHEREAS, the Co-Owners desire to enter into an agreement to operate
the Aircraft with flight crew on a Joint Ownership basis as defined in Section
91.501(c)(3) of the Federal Aviation Regulations (FAR); and

         WHEREAS, the Co-Owners desire to appoint ITC to act as their Agent in
undertaking certain duties and responsibilities of operating the aircraft and
administering the terms of this Joint Ownership Agreement;

         NOW, THEREFORE, the Co-Owners, declaring their intention to enter into
and be bound by this Joint Ownership Agreement, and for the good and valuable
consideration set forth below, hereby covenant and agree as follows:

                                   ARTICLE 1
                          RELATIONSHIP AMONG CO-OWNERS

         The Co-Owners shall own the Aircraft as tenants-in-common. The
percentage ownership interests of the Co-Owners in the Aircraft are set forth
on Exhibit B hereto. Each such interest and all of the rights and obligations
associated with each Co-Owner's tenant-in-common interest in the Aircraft shall
be known as an "Interest." Each Interest shall be entitled to equal


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<PAGE>   2
rights and privileges and subject to equal duties and obligations with every
other Interest, and each Interest shall be subject to all of the terms and
conditions hereof.

                                   ARTICLE 2
                        APPOINTMENT AND REMOVAL OF AGENT

         The Co-Owners hereby appoint ITC to act as their Agent (the "Agent")
with respect to certain aspects of the ownership and operation of the Aircraft
as more fully set forth in this Agreement. The Co-Owners may, at any time, by a
majority vote of the Interests in the Aircraft, remove ITC as Agent and appoint
another of the Co-Owners as Agent; provided, that any such removal and
replacement shall become effective only upon the replacement Co-Owner executing
and delivering a copy of this Agreement, as Agent, as evidence of its agreement
to be bound by the provisions hereof applicable to the Agent.

                                   ARTICLE 3
                           SCHEDULING USE OF AIRCRAFT

         3.01  Final Authority in Scheduling. The Agent shall have final
authority over the scheduling of the Aircraft, provided, however, that the
Agent will use its best efforts to accommodate the needs of the Co-Owners, and
to avoid conflicts in scheduling. As a general matter, the Agent will schedule
the Aircraft on a first come, first serve basis, except that in the event of
scheduling conflicts, priority will be given to the Co-Owner with the larger
percentage ownership interest in the Aircraft.

         3.02  Scheduling Procedure. Each Co-Owner shall provide the Agent with
requests for flight time and proposed flight schedules as far in advance of any
given flight as possible, and in any case, at least 24 hours in advance of the
Co-Owner's planned departure except in case of an emergency, as determined in
the sole discretion of the Agent, in which case the Agent shall use all
reasonable efforts to make the Aircraft available. Requests for flight time
shall be in a form, whether oral or written, mutually convenient to, and agreed
upon by, the parties. A Co-Owner shall provide the following scheduling and
flight time information for each proposed flight, as required by the Agent or
the flight crew:

                  1.  proposed departure point;
                  2.  destination;
                  3.  date and time of departure or arrival;
                  4.  the number of anticipated passengers;
                  5.  the nature and extent of luggage and/or cargo
                      to be carried;
                  6.  the date and time of a return flight, if any;
                  7.  any other information concerning the proposed


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<PAGE>   3


                  flight that may be pertinent or required by the Agent or the
                  flight crew.

                                   ARTICLE 4
                            MAINTENANCE OF AIRCRAFT

         The Agent, on behalf of and at the expense of the Co-Owners, shall be
solely responsible for securing maintenance, preventive maintenance and
required or otherwise necessary inspections on the Aircraft. No period of
maintenance, preventive maintenance or inspection shall be delayed or postponed
for the purpose of scheduling the Aircraft, unless said maintenance or
inspection can be safely conducted at a later time in compliance with all
applicable laws and regulations, and within the sole discretion of the pilot in
command.

                                   ARTICLE 5
                                AIRCRAFT SAFETY

         5.01  Provision of Flight Crew. The Agent shall employ on behalf of
the Co-Owners and furnish a fully qualified flight crew for all operations of
the Aircraft for the duration of this Agreement. Each Co-Owner shall have the
right to request that the Agent employ and furnish a particular fully
qualified flight crew with respect to a particular flight taken by such
Co-Owner and the Agent shall use its best efforts to comply with such request,
provided that such flight crew or member of a flight crew meets the
requirements of the FAR and such other safety standards established by the
Agent in its reasonable discretion.

         5.02  Flight Crew Control. The flight crew shall have full and
exclusive authority to exercise all of its duties and responsibilities in
regard to the safety of each flight conducted hereunder in accordance with
applicable FAR. Each Co-Owner shall be considered and, in fact, will be in
operational control of the Aircraft when that Co-Owner uses the Aircraft. Each
Co-Owner specifically agrees that the flight crew, in its sole discretion, may
terminate any flight, refuse to commence any flight, or take other action which
in the considered judgment of the pilot in command is necessitated by
considerations of safety. No such action of the pilot in command shall create
or support any liability for loss, injury, damage or delay to any Co-Owner or
any other person. The Co-Owners further agree that no party shall be liable for
delay or failure to furnish or return the Aircraft or crew pursuant to this
Joint Ownership Agreement when such failure is caused by government regulation
or authority, mechanical difficulty, war, civil commotion, strikes or labor
disputes, weather conditions, or acts of God.



                                      -3-
<PAGE>   4


                                   ARTICLE 6
                                   EXPENSES

         6.01 Payment of Expenses. The Agent, on behalf of the Co-Owners, shall
pay promptly when due and payable all bills and assessments for services or
supplies and other expenses incurred in connection with the maintenance,
operation, supervision and management of the Aircraft.

         6.02 Invoices.

                  (a) Annually, the Agent shall furnish to each Co-Owner an
invoice ("Annual Invoice") for the Indirect Operating Cost Charge applicable
to such Co-Owner such period which sets forth the amount of indirect
operating costs ("Indirect Operating Costs") and Other Charges to be paid by
each Co-Owner as determined pursuant to Section 7.01 hereof.

                  (b) Each month, the Agent shall furnish to each Co-Owner an
invoice ("Monthly Invoice") for flights taken by such Co-Owner during such
period which sets forth the amount of direct operating expenses ("Direct
Operating Expenses") to be paid by each Co-Owner for that invoiced period as
determined pursuant to Section 7.02 hereof, and any additional charges to be
paid by each Co-Owner for the invoiced period as determined pursuant to Section
7.03 hereof ("Line Item Charges"). In the event of substantial unanticipated
maintenance expenses, the Agent shall furnish to each Co-Owner an invoice
("Special Maintenance Invoice") for the Special Maintenance Charge applicable
to such Co-Owner determined pursuant to Section 7.02 hereof.

                  (c) The Agent shall have the authority in its reasonable
discretion to bill the Co-Owners in advance to cover future and anticipated
expenses in connection with the Aircraft.

         6.03 Maintenance of Books and Records. The Agent shall maintain
separate books and records for the operation and use of the Aircraft, including
records relating to the calculation of the Indirect Operating Costs and Other
Charges and the Direct Operating Expenses and the Line Item Charges. Such books
and records shall be open to inspection by the Co-Owners during normal business
hours.

                                   ARTICLE 7
                  ALLOCATION AND PAYMENT OF AIRCRAFT EXPENSES

         7.01 Sharing and Allocating Indirect Operating Costs and Other Charges

                  (a) Each calendar year, the Agent will prepare an estimate of
the

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<PAGE>   5
Indirect Operating Costs attributable to each of the Aircraft. The estimates of
Indirect Operating Costs shall be determined in the reasonable discretion of the
Agent and shall include, but are not limited to:

                  1.     taxes;
                  2.     pilot expenses not directly attributable to a
                         particular flight;
                  3.     passenger amenities, landing & aircraft RON
                         fees not directly attributable to a particular
                         flight;
                  4.     flight crew salaries & benefits;
                  5.     contract pilots;
                  6.     training;
                  7.     legal and professional fees;
                  8.     insurance;
                  9.     hangar rental;
                  10.    communications;
                  11.    supplies; and
                  12.    miscellaneous.

                  (b)    Each calendar year, the Agent, in its reasonable
     discretion, will determine appropriate charges (the "Other Charges") to
     reflect the annual wear and tear to the Aircraft resulting from the
     Co-Owners' use of the Aircraft.

                  (c)    Each Co-Owner shall be responsible for its allocable
     share of the Indirect Operating Costs and the Other Charges attributable to
     the Aircraft during an annual invoice period. Each Co-Owner's allocable
     share of such costs for the Aircraft shall be determined by multiplying
     total amount of Indirect Operating Costs and Other Charges for the invoice
     period by the percentage of the total use of the Aircraft during the
     invoice period attributable to that Co-Owner (based on miles of operation).

                  (d)    Amounts paid by the Co-Owners for Indirect Operating
     Costs shall be used to reimburse the Agent for the payment of such Indirect
     Operating Costs. Other Charges paid by the Co-Owners shall be credited to
     each of the Co-Owners in proportion to their relative ownership interests
     in the Aircraft.

         7.02     Sharing and Allocating of Direct Operating Expenses.

                  (a)     Each Co-Owner shall be responsible for its allocable
     share of the Direct Operating Expenses attributable to the Aircraft during
     an invoice period. Each Co-

                                      -5-

<PAGE>   6
Owner's allocable share of such expenses shall be determined by multiplying the
number of miles such Co-Owner operated the Aircraft during the invoice period
by an amount estimated by the Agent to cover Direct Operating Expenses. However,
this amount may be adjusted in the reasonable discretion of the Agent such that
the amount will approximate the Direct Operating Expenses incurred by the use of
the Aircraft. The Agent shall base its estimate of Direct Operating Expenses on
the following factors, but is not limited to considering only these factors:

                  1.  fuel, oil, lubricants, and other additives used; during
                      and by reason of a flight;
                  2.  engine, thrust reverser, and propeller reserve
                      allowances, as applicable;
                  3.  hot section reserve allowances;
                  4.  air frame and systems maintenance;
                  5.  a ten (10) percent vectoring fee; and
                  6.  a charge of $150 for any flight of less than 250
                      nautical miles taken in the Beech Jet 400A
                      bearing manufacturer Serial No. RK-157 and
                      Federal Aviation Administration Registration
                      No. N397AT to cover certain higher costs of
                      short flights.

                  (b) Each Co-Owner shall be responsible for its allocable share
of any substantial, unanticipated maintenance expenses attributable to the
Aircraft during any calendar year. Each Co-Owner's allocable share of such
expenses shall be determined by multiplying the number of miles such Co-Owner
operated the Aircraft during that calendar year by an amount estimated by the
Agent to cover such unanticipated maintenance expenses.

                  (c) Each Co-Owner will be invoiced monthly for Direct
Operating Expenses based on the number of nautical miles actually flown by each
Co-Owner. Each Co-Owner will be invoiced annually for Direct Operating Expenses
incurred as substantial unanticipated maintenance expenses based on the number
of nautical miles actually flown by each Co-Owner.

         7.03  Sharing and Allocating of Line Item Charges.  Each Co-Owner shall
be responsible for Line Item Charges relating to the ownership, operation, and
maintenance of the Aircraft attributable to such Co-Owner during each month.
Line Item Charges shall be determined in the reasonable discretion of the Agent
and shall include, but are not limited to:

                  1.  tie down expenses;

                  2.  catering expenses;

                  3.  customs fees;

                                      -6-
<PAGE>   7

                 4.  landing fees, ramp fees, and parking fees; and
                 5.  applicable pilot expenses directly attributable to such
                     flight

The amount of Line Item Charges allocated to and to be paid by each Co-Owner
shall be determined by the Agent.

        7.04  Procedure for Payment of Expenses by Co-Owners. Within fifteen
(15) days after the date of an invoice described in Section 6.02 hereof, each
Co-Owner shall pay to the Agent such Co-Owner's share of applicable charges as
set forth in the invoice. Any Co-Owner who is more than thirty (30) days in
arrears in payment of an invoice prepared pursuant to this Agreement, shall not
be permitted to use the Aircraft.

         7.05  Depreciation. For each calendar year, each Co-Owner shall be
allocated its allocable share of the depreciation attributable to the Aircraft.
Each Co-Owner's allocable share of such depreciation shall be determined by
multiplying the total depreciation for the calendar year by each Co-Owner's
Interest.

        7.06  Tax Liabilities and Benefits. For each calendar year, each
Co-Owner shall be entitled to a pro rata percent share of the gain, loss,
deduction, credit, or any tax benefits or liabilities with respect to the
Aircraft.


                                   ARTICLE 8
                                     BUDGET

         For each calendar year, the Agent shall prepare a budget ("Budget")
for the expenses attributable to the operation, use and occupancy of the
Aircraft. The Budget shall set forth an estimate of the total Indirect
Operating Costs per aircraft for such calendar year (including any applicable
reserves), the total Direct Operating Expenses for such calendar year
(including any applicable reserves), and the total estimated number of flight
miles for such calendar year. The Budget shall also set forth itemized estimates
of the Indirect Operating Costs and Direct Operating Expenses for such
calendar year. The Budget for each invoice period shall be the estimated total
Indirect Operating Costs and Direct Operating Expenses for such calendar year
allocated equally to each applicable invoice period. The Budget shall become
final when approved by the Co-Owners, with such changes as they may require, in
accordance with Section 9.02 or Section 9.03 hereof.

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<PAGE>   8
                                   ARTICLE 9
                      RIGHTS AND OBLIGATIONS OF CO-OWNERS.

         9.01  Meetings.  Upon the request of any Co-Owner, the Agent shall, and
any Co-Owner may, call a meeting of the Co-Owners to consider and act upon any
matter which may properly be the subject of such consideration and action
including, but not limited to, actions required pursuant to Section 9.04 hereof,
by giving notice thereof to all Co-Owners at least one (1) day prior to the date
of such meeting, which notice shall contain the date, time and place of the
meeting, as well as the subject matter or matters to be considered and acted
upon by the Co-Owners. Only such matters as shall have been specified in such
notice shall be considered and acted upon at the meeting unless otherwise
unanimously agreed by all Co-Owners entitled to notice. A written waiver of
notice, signed before or after a meeting by a Co-Owner entitled to notice of
such meeting, or the presence of the Co-Owner at the meeting (which shall be
deemed to be a waiver of notice) shall be deemed equivalent to notice.

         9.02  Voting.  At any meeting of the Co-Owners, each Co-Owner shall be
entitled to vote in accordance with such Co-Owner's Interest and such votes may
be cast either in person or by Agent or proxy duly authorized in writing. Except
as otherwise provided herein, the vote of the Co-Owners owning at least a
majority of all the Interests voting, in person or by proxy, shall decide all
questions properly submitted for a vote of the Co-Owners.

         9.03  Action by Written Consent.  Any action which the Co-Owners are
authorized to take at a meeting may be taken without a meeting and without
notice if a consent in writing setting forth the action so taken shall be signed
by Co-Owners owning at least a majority of the Interests, and such consent shall
have the same force and effect as a unanimous vote of the Co-Owners.

         9.04  Signature of Co-Owners Required.  Any legal document or agreement
relating to the ownership, operation, or use of the Aircraft shall be executed
by each of the Co-Owners, provided, however, that agreements between the Agent
and any flight crew employed by the Agent pursuant to Article 2 hereof and
agreements with third parties related to maintenance of the Aircraft and safe
operation of the Aircraft pursuant to Articles 3, 4 and 5 hereof, shall be
executed solely by the Agent on behalf of the Co-Owners, provided, further, that
each of the Co-Owners may grant to the Agent a power of attorney to execute any
legal documents or agreements relating to the ownership, operation or use of the
Aircraft by and for the benefit of such Co-Owner.

         9.05  Waiver of Partition.  The Co-Owners hereby waive whatever rights
they may have to demand the partition, or sale for partition, of the Aircraft
under the laws of the State of Georgia, or any other law.


                                      -8-
<PAGE>   9
         9.06     Termination of Co-Owner's Interest. A Co-Owner's Interest may
be terminated at any time upon the affirmative vote of Co-Owners owning at least
a majority of all of the Interests in accordance with Section 9.02 and Section
9.03. Upon the termination of a Co-Owner's Interest, the terminated Co-Owner's
Interest shall be purchased for the fair market value of the Interest by those
Co-Owners affirmatively voting to terminate such Interest, pro rata in
accordance with their Interests or as they may otherwise agree. For purposes of
this Section 9.06, the Agent, in its reasonable discretion, shall be responsible
for determining the fair market value of a terminated Co-Owner's Interest.

                                   ARTICLE 10
                         REPRESENTATIONS AND WARRANTIES

         Each Co-Owner represents and warrants that:

                  (a)     It will use the Aircraft, consistent with FAR Part
91.501, for and on account of its own business only, (including without
limitation, with respect to itself, its subsidiaries, and its affiliates), and
will not use the Aircraft for the purposes of providing transportation of
passengers or cargo in air commerce for compensation or hire:

                  (b)     It will refrain from incurring any mechanic's or other
lien in connection with inspection, preventative maintenance, maintenance or
storage of the Aircraft, whether permissible or impermissible under this Joint
Ownership Agreement, not will it make any attempt to convey, mortgage, assign,
lease or any way alienate the Aircraft or create any kind of lien or security
interest involving the Aircraft or do anything or take any action that might
mature into such a lien;

                  (c)     During the term of this Joint Ownership Agreement, it
will abide by and conform to all such laws, governmental and airport orders,
rules and regulations, as shall from time to time be in effect relating in any
way to the operation and use of the Aircraft under this Joint Ownership
Agreement; and

                  (d)     It will comply with and take (or cause to be taken)
all such actions as may reasonably be required to assure compliance with the
terms and conditions of any insurance policies obtained by the Co-Owners.

                                   ARTICLE 11
                             ASSIGNMENT OF INTERESTS

         Neither this Joint Ownership Agreement nor any party's interest herein
shall be assignable to any other party whatsoever. This Joint Ownership
Agreement shall inure to the benefit of and be binding upon the parties hereto,
their heirs, representatives and successors.

                                      -9-



<PAGE>   10
                                   ARTICLE 12
                                  TAX ELECTION

         12.01 Election. If, for federal income tax purposes, this Joint
Ownership Agreement, the relationship established hereby, and the operations
conducted hereunder are regarded as a partnership, as that term is defined by
the Internal Revenue Code of 1986, as amended, then the Co-Owners hereby elect
not to be treated as a partnership and elect to be excluded from the
application of all of the provisions of Subchapter K, Chapter 1, Subtitle A, of
the Internal Revenue Code of 1986, as amended. In making this election, each
Co-Owner acknowledges that any income derived by it by reason of its ownership
of an Interest can be adequately determined without the necessity for any
computation of partnership taxable income, and each Co-Owner agrees not to give
any notices or take any other action inconsistent with the election hereby made.

         12.02 Evidence. The Agent is hereby authorized and directed to execute
such evidence of the foregoing election, or to make such an election if the
election herein contained is insufficient for any reason, as may be required by
the Secretary of the Treasury of the United States or the Internal Revenue
Service. Each Co-Owner agrees to execute such documents and to furnish such
other evidences as may be required to evidence such election.

                                   ARTICLE 13
                                 MISCELLANEOUS

         13.01 Notice. Any notice, demand, request or report required or
permitted to be given or made to a Co-Owner under this Joint Ownership
Agreement shall be in writing and shall be deemed given or made when delivered
in person or when sent by first class United States mail or by other means of
written communication to the Co-Owner at its address set forth on EXHIBIT A
attached hereto.

         13.02 Governing Law: Separability of Provisions. The laws of the State
of Georgia (excluding the conflicts of laws rules thereof) shall govern the
validity of this Joint Ownership Agreement, the construction of its terms and
interpretation of the rights and duties of the parties. If any provision of this
Joint Ownership Agreement shall be held to be invalid, the remainder of this
Joint Ownership Agreement shall not be affected thereby.

         13.03 Entire Agreement. This constitutes the entire agreement among
the parties; it supersedes any prior agreement or understandings among them,
oral or written, all of which are hereby canceled.

         13.04 Headings, etc. The headings in this Joint Ownership Agreement are

                                      -10-

<PAGE>   11
inserted for convenience of reference only and shall not affect interpretation
of this Joint Ownership Agreement. Wherever from the context it appears
appropriate, each term stated in either the singular or the plural shall include
the singular and the plural, and pronouns stated in either the masculine, the
feminine, or the neuter gender shall include the masculine, feminine and the
neuter.

                  13.05 Binding Provisions. The covenants and agreements
contained herein shall be binding upon and inure to the benefit of the heirs,
executors, administrators, and successors of the respective parties hereto.

                  13.06 No Waiver. The failure of any Co-Owner to seek redress
for violation, or to insist on strict performance or, any covenant or condition
of this Joint Ownership Agreement shall not prevent a subsequent act which would
have constituted a violation from having the effect of an original violation.

                  130.7 Further Action. The parties shall execute and deliver
documents, provide all information and take or refrain from taking action as may
be necessary or appropriate to achieve the purposes of this Joint Ownership
Agreement.

                  13.08 Insurance Provisions. Aviation insurance shall be
maintained at all times by Agent through insurance carriers reasonably
acceptable to Co-Owners and shall include each of the Co-Owners as Joint Named
Insureds for Bodily Injury and Property Damage liability, including passengers,
for limits not less than $100,000,000 Combined Single Limits per occurrence. The
aircraft shall be insured against loss by Physical Damage for 100% of its
current value. Such Physical Damage insurance shall be structured on a "Stated
Value" basis, and all such losses shall be adjusted exclusively through Agent.
The conditions of insurance shall be maintained in accordance with the actual
use and territory of operations of the Aircraft. The amount and type of
insurance carried may be changed from time to time by Agent as it deems
reasonably necessary to protect the interest of the Co-Owners and to adhere to
then current aviation insurance standards.

                  13.09 Indemnification. (a) Each party to this Agreement will
indemnify the others including, without limitation, stockholders, or any of its,
or their directors, officers, agents, employees, partners and protect, defend
and hold one another harmless from and against any and all loss, cost, damage,
injury or expense ("Loss"), incurred by reason of any breach by the indemnifying
party of any of its representations of obligations set forth in this Agreement.

                  (b) Each of the parties also hereby indemnifies and shall hold
the others harmless against any Loss incurred as the direct result of or arising
out of the imposition

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<PAGE>   12
on the Aircraft of any Federal or other tax lien or the foreclosure thereof by
virtue of the failure to pay or underpayment by the indemnifying party of the
Federal or other taxes payable by such indemnifying party.

                  (c)     In all cases, the Co-Owners agree that the proceeds of
any insurance to which they are entitled herein shall be deemed to be accepted
as the Co-Owners' sole recourse against Agent for any Loss incurred by the
Co-Owner with respect to ownership or operation of the Aircraft or otherwise in
connection with this Agreement, except to the extent cause by the gross
negligence or willful misconduct of Agent.

                  13.10 Counterparts. This Joint Ownership Agreement may be
executed simultaneously in two or more counterparts, any one of which need not
contain the signatures of more than one party, but all such counterparts taken
together will constitute one and the same Joint Ownership Agreement.

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<PAGE>   13

         IN WITNESS WHEREOF, the parties hereto have caused the signatures of
their authorized representatives to be affixed below to be effective on the day
and year first above written. The persons signing below warrant their authority
to sign.


                                             AGENT:


                                             ITC Service Company



                                             By: /s/
                                                ------------------------
                                                Chief Pilot
ATTEST:


/s/
---------------------------
Secretary


                                             CO-OWNERS:

                                             ITC Service Company



                                             By: /s/
                                                ------------------------
                                                President

ATTEST:


/s/
---------------------------
Secretary


                                             Powertel, Inc.



                                             By: /s/
                                                ------------------------

ATTEST:


/s/
---------------------------
Assistant Secretary

                                      -13-





<PAGE>   14



                                         ITC*DeltaCom Communications, Inc.


                                         By: /s/
                                            ------------------------------------


ATTEST:

/s/
-----------------------------
Secretary


                                         KNOLOGY Holding, Inc.


                                         By: /s/
                                            ------------------------------------


ATTEST:

/s/
-----------------------------
Secretary

                                      -14-
<PAGE>   15

                                                                    EXHIBIT A

                                  CO-OWNERS


IC Service Company
1239 O. G. Skinner Drive
West Point, GA 31833

Powertel, Inc.
1233 O. G. Skinner Drive
West Point, GA 31833

ITC*DeltaCom Communications, Inc.
1241 O. G. Skinner Drive
West Point, GA 31833

KNOLOGY Holdings, Inc.
1241 O. G. Skinner Drive
West Point, GA 31833

                                     - 15 -
<PAGE>   16

                                                                    EXHIBIT B

                         Percentage of Interest Owned

<TABLE>
<S>                                      <C>
ITC Service Company                      97%
1239 O. G. Skinner Drive
West Point, GA 31833

Powertel, Inc.                            1%
1233 O. G. Skinner Drive
West Point, GA 31833

ITC*DeltaCom Communications, Inc.         1%
1241 O. G. Skinner Drive
West Point, GA 31833

KNOLOGY Holdings, Inc.                    1%
1241 O. G. Skinner Drive
West Point, GA 31833
</TABLE>

                                      -16-