Exhibit 10.9.6




**EIGHTH
MODIFICATION AGREEMENT**
  BY THIS
EIGHTH MODIFICATION AGREEMENT (the "Agreement"), made and entered into as of the
13th day of April, 2005, WELLS FARGO BANK, NATIONAL ASSOCIATION, as
administrative agent (the "Administrative Agent") for the Banks listed in the
hereinafter defined Credit Agreement (the "Banks") and as the Issuing Bank and
the Swing Line Lender, and KNIGHT TRANSPORTATION, INC., an Arizona corporation
(the "Company") and all present and future Significant Subsidiaries of the
Company (with the Company, the "Borrower"), in consideration of the mutual
covenants herein contained and other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, hereby confirm and
agree as follows:
  **SECTION
1.**  **RECITALS;
ACKNOWLEDGEMENTS.**
  1.1  The
Borrower and the Administrative Agent and the Banks entered into that Credit
Agreement dated April 6, 2001 (as amended from time to time, the "Credit
Agreement") to provide financial accommodations to the Borrower as provided
therein. The Credit Agreement was previously amended by that Modification
Agreement dated as of June 5, 2001, that Second Modification Agreement
dated as of November 19, 2001, that Third Modification Agreement dated as
of February 13, 2003, that Fourth Modification Agreement dated as of September
15, 2003, that Fifth Modification Agreement dated as of December 15, 2003, that
Sixth Modification Agreement dated as of May 13, 2004 and that Seventh
Modification Agreement dated as of October 4, 2004.
  1.2  Borrower
and the Administrative Agent, with the consent of the Banks, desire to modify
the Credit Agreement as set forth herein.
  1.3  All
undefined capitalized terms used herein shall have the meaning given them in the
Credit Agreement.
  **SECTION
2.**  **CREDIT
AGREEMENT.**
  2.1  The
following definitions in Section 1.1 of the Credit Agreement are hereby amended
to read as follows:
  "Letter
of Credit Commitment" shall mean $25,000,000.00.
  "Maximum
RLC Commitment" shall mean $25,000,000.00.
  2.2  The
reference in Section 2A.1(a) of the Credit Agreement to an issuance fee in an
amount equal to "seventy-two and one-half basis points (0.725%)" per annum is
hereby amended to read "sixty-two and one-half basis points
(0.625%)."
  2.3  Schedule
2.1 of the Credit Agreement is hereby amended to read as attached
hereto.
  2.4  All
references in the Note to "11,000,000.00" or to "Eleven Million and NO/100
Dollars" are hereby amended to read "25,000,000.00" and "Twenty-Five Million and
NO/100 Dollars," respectively.
 
  **SECTION
3.**  **OTHER
MODIFICATIONS, RATIFICATIONS AND AGREEMENTS.**
  3.1  All
references to the Credit Agreement in the other Loan Documents are hereby
amended to refer to the Credit Agreement as hereby amended.
  3.2  Borrower
hereby reaffirms to the Banks each of the representations, warranties, covenants
and agreements of Borrower set forth in the Credit Agreement, with the same
force and effect as if each were separately stated herein and made as of the
date hereof.
  3.3  Borrower
hereby ratifies, reaffirms, acknowledges, and agrees that the Notes and the
Credit Agreement represent valid, enforceable and collectible obligations of
Borrower, and that there are no existing claims, defenses, personal or
otherwise, or rights of setoff whatsoever with respect to any of these documents
or instruments. Borrower further acknowledges and represents that no event has
occurred and no condition exists that, after notice or lapse of time, or both,
would constitute a default under this Agreement, the Notes or the Credit
Agreement.
  3.4  All
terms, conditions and provisions of the Credit Agreement are continued in full
force and effect and shall remain unaffected and unchanged except as
specifically amended hereby. The Credit Agreement, as amended hereby, is hereby
ratified and reaffirmed by Borrower, and Borrower specifically acknowledges the
validity and enforceability thereof.
  **SECTION
4.**  **GENERAL.**
  4.1  This
Agreement in no way acts as a release or relinquishment of those rights securing
payment of the Loans. Such rights are hereby ratified, confirmed, renewed and
extended by Borrower in all respects.
  4.2  The
modifications contained herein shall not be binding upon the Banks until the
Administrative Agent shall have received all of the following:
  (a)  An
original of this Agreement fully executed by the Borrower.
  (b)  Such
resolutions or authorizations and such other documents as the Administrative
Agent may require relating to the existence and good standing of the Borrower
and the authority of any person executing this Agreement or other documents on
behalf of the Borrower.
  4.3  Borrower
shall execute and deliver such additional documents and do such other acts as
the Banks may reasonably require to fully implement the intent of this
Agreement.
  4.4  Borrower
shall pay all costs and expenses, including, but not limited to, reasonable
attorneys' fees incurred by the Administrative Agent in connection herewith,
whether or not all of the conditions described in Paragraph 4.2 above are
satisfied. Banks, at their option, but without any obligation to do so, may
advance funds to pay any such costs and expenses that are the obligation of the
Borrower, and all such funds advanced shall bear interest at the highest rate
provided in the Notes and shall be due and payable upon demand.
 -2-
  4.5  Notwithstanding
anything to the contrary contained herein or in any other instrument executed by
Borrower, the Administrative Agent or the Banks, or in any other action or
conduct undertaken by Borrower, the Administrative Agent or the Banks on or
before the date hereof, the agreements, covenants and provisions contained
herein shall constitute the only evidence of the Banks' consent to modify the
terms and provisions of the Credit Agreement. Accordingly, no express or implied
consent to any further modifications involving any of the matters set forth in
this Agreement or otherwise shall be inferred or implied by the Banks' consent
to this Agreement. Further, the Banks' consent to this Agreement shall not
constitute a waiver (either express or implied) of the requirement that any
further modification of the Credit Agreement shall require the express written
consent of the Banks; no such consent (either express or implied) has been given
as of the date hereof.
  4.6  Time is
hereby declared to be of the essence hereof of the Credit Agreement, and Banks
require, and Borrower agrees to, strict performance of each and every covenant,
condition, provision and agreement hereof, of the Credit Agreement.
  4.7  This
Agreement shall be binding upon, and shall inure to the benefit of, the parties
hereto and their heirs, personal representatives, successors and
assigns.
  4.8  This
Agreement is made for the sole protection and benefit of the parties hereto, and
no other person or entity shall have any right of action hereon.
  4.9  This
Agreement shall be governed by and construed according to the laws of the State
of Arizona.
  IN
WITNESS WHEREOF, these presents are executed as of the date indicated
above.
  WELLS
      FARGO BANK, NATIONAL ASSOCIATIONBy:
    /s/Keri
      TigniniName:
    Keri
      TigniniIts:
    Vice
      PresidentADMINISTRATIVE
      AGENTKNIGHT
      TRANSPORTATION, INC.By:
    /s/
      Timothy M. KohlName:
    Timothy
      M. KohlIts:
    President
  -3-
  
 QUAD-K
      LEASING, INC., an Arizona corporationBy:
    /s/
      David A. JacksonName:
    David
      A. JacksonIts:
    TreasurerBORROWER
 
 
  -4-
  **CONSENT
OF THE BANKS**
  Re:  Knight
Transportation, Inc.
  The
following:
  (a)  is a Bank
named in that Credit Agreement dated April 6, 2001 between Knight
Transportation, Inc., an Arizona corporation (the "Company"), all present and
future Significant Subsidiaries of the Company (the "Borrower"), Wells Fargo
Bank, National Association, as administrative agent for the Banks (the
"Administrative Agent"), and the Banks; and
  (b)  consents
to that Eighth Modification Agreement dated April 13, 2005 entered into between
the Borrower and the Administrative Agent.
  WELLS
      FARGO BANK, NATIONAL ASSOCIATIONBy:
    /s/ Keri
      TigniniName:
    Keri
      TigniniIts:
    Vice
      President"Bank"
 
  
  **SCHEDULE
2.1**
 
 **COMMITMENTS
OF BANKS**
 as to the
Facility
 as of
April 13, 2005
 
 
 Bank
    
    %
    
    $1.
    
    
    Wells
      Fargo Bank,
      National
      Association
    
    
    100%
    
    
    $25,000,000.00Maximum
      RLC
      Commitment
    
    
    100%
    
    
    $25,000,000.00
 
 Addresses:1.
    100
      West Washington
      Commercial
      Banking
      MAC
      S4101-251
      Phoenix,
      Arizona 85003
      Attention:
      Keri Tignini
      Phone:
      602-378-4593
      Fax:
      602-378-4758






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