For Immediate Release

                      SWIFT AND M.S. CARRIERS CLOSE MERGER

     Phoenix,  Arizona  and  Memphis,   Tennessee,  June  29,  2001  -  -  Swift
Transportation Co., Inc. (Nasdaq:  SWFT) and M.S. Carriers,  Inc. (Nasdaq: MSCA)
today announced that they have completed their merger.

     Swift's  Chairman,  President,  and Chief  Executive  Officer,  Jerry Moyes
stated:  "It has been almost one year since Mike  Starnes and I first  discussed
merging  Swift and M.S.  Carriers.  Over that time we have never  wavered in our
commitment  to bringing  our two  companies  together  and  building the premier
truckload  carrier in North  America.  We have used the past  several  months to
carefully plan our integration efforts, and we expect a smooth transition.

     With the merger,  Swift  expects to generate over $2 billion in revenue for
2001. The Company's  15,000  tractors and 45,000  trailers will offer  customers
tremendous  capacity  throughout the continental  United States, and to and from
Mexico and Canada. Among publicly traded truckload carriers,  Swift believes the
merged company is:

        *   1st in revenue (excluding intermodal)
        *   1st in net earnings
        *   1st in number of tractors
        *   1st in number of trailers (excluding containers)
        *   1st in stockholders' equity
        *   1st in market capitalization

     As I stated last  December,  we  believed  M.S.  Carriers  offered the best
strategic fit of any potential merger partner. I believe in the merger even more
strongly today and wish to welcome the M.S. Carriers customers,  employees,  and
stockholders to our company."

     M.S.  Carriers  stockholders  will receive 1.7 shares of Swift common stock
for each  share of M.S.  Carriers  common  stock,  with cash paid in lieu of the
issuance  of  fractional  shares.  Swift  common  stock is traded on the  Nasdaq
National  Market under the symbol  "SWFT." The merger  became  effective at 8:00
p.m. Eastern time today.  M.S.  Carriers  terminated  registration of its common
stock with the Securities  and Exchange  Commission and delisted from the Nasdaq
National Market at the close of business today.

     M.S.  Carriers  stockholders  who hold  their own stock  certificates  will
receive in the mail  exchange  materials  from  Mellon  Investor  Services,  the
exchange agent. M.S. Carriers stockholders who hold shares through a broker will
exchange their shares through their broker.  If you have any questions about the
exchange procedures, please call Mellon Investor Services at 1-800-777-3674.

     Swift  announced  it closed its  offering of 1.2  million  shares of common
stock at $16.00. The underwriters  exercised in full their over-allotment option
to purchase an additional 120,000 shares.

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     This press release contains statements that may constitute  forward-looking
statements,  usually  identified  by words  such as  "anticipates,"  "believes,"
"estimates," "projects," "expects," or similar expressions. These statements are
made pursuant to the safe harbor provisions of the Private Securities Litigation
Reform Act of 1995. Such statements include,  but are not limited to, statements
concerning the merger with M.S. Carriers,  financial and operating expectations,
and other  information.  Such  statements are based upon the current beliefs and
expectations  of Swift's  management  and are subject to  significant  risks and
uncertainties.   Actual   results  may  differ  from  those  set  forth  in  the
forward-looking  statements.  As to Swift's  business and financial  performance
generally,  the following factors,  among others,  could cause actual results to
differ materially from those in forward-looking  statements:  excess capacity in
the  trucking  industry;  significant  increases or rapid  fluctuations  in fuel
prices,  interest  rates,  fuel taxes,  tolls,  license and  registration  fees,
insurance  premiums  and  driver  compensation,  to the  extent  not  offset  by
increases in freight rates or fuel  surcharges;  difficulty  in  attracting  and
retaining  qualified  drivers and owner  operators,  especially  in light of the
current shortage of qualified drivers and owner operators; recessionary economic
cycles and  downturns in  customers'  business  cycles,  particularly  in market
segments and industries (such as retail and  manufacturing) in which Swift has a
significant  concentration of customers;  seasonal factors such as harsh weather
conditions that increase  operating costs;  increases in driver  compensation to
the extent not offset by increases in freight  rates;  the inability of Swift to
continue to secure acceptable  financing  arrangements;  the ability of Swift to
continue to  identify  and combine  acquisition  candidates  that will result in
successful  combinations;  an unanticipated increase in the number of claims for
which Swift is self insured;  competition  from  trucking,  rail and  intermodal
competitors;  and a significant  reduction in or termination of Swift's trucking
services  by a key  customer.  With  respect  to the merger  transaction,  these
uncertainties  include:  the risk  that the  businesses  will not be  integrated
successfully or that integration costs will exceed our estimates;  the risk that
the revenue and other  synergies and costs savings  anticipated  from the merger
may not be fully  realized  or may take  longer to realize  than  expected;  the
difficulty  the stock  market  may have in  valuing  the  business  model of the
combined  company;  and  disruption  from the merger making it more difficult to
maintain  relationships  with  customers,  employees,  or suppliers.  Additional
factors that could cause results to differ  materially  from those  described in
the  forward-looking  statements can be found in the registration  statements on
Form S-3 and Form S-4 filed by Swift and the 2000 Annual  Report on Form 10-K of
Swift  and  M.S.  Carriers.  Swift  is under  no  obligation  to (and  expressly
disclaims any such obligation to) update or alter its forward-looking statements
whether as a result of new information, future events, or otherwise.

     Swift can be reached on the Web at  www.swifttrans.com,  and M.S. Carriers'
web address is www.mscarriers.com

Contact:

For Swift:                                 For M.S. Carriers:
William F. Riley, III                      Joseph Barrow
Senior Executive Vice President   - or -   Senior Vice President - Finance  and
and CFO                                    Administration, CFO, and Secretary-
                                           Treasurer
602/269-9700                               901/332-2500



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