UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

                Date of Report (Date of earliest event reported):
                                  July 21, 2004



                           KNIGHT TRANSPORTATION, INC.
             (Exact name of registrant as specified in its charter)



          Arizona                    000-24946                 86-0649974
(State or other jurisdiction   (Commission File Number)     (I.R.S. Employer
     of incorporation)                                     Identification No.)




          5601 W. Buckeye Road, Phoenix, Arizona           85043
         (Address of principal executive offices)        (Zip Code)


               Registrant's telephone number, including area code:
                                 (602) 269-2000


                                 Not applicable
          (Former name or former address, if changed since last report)





<PAGE>



Item 1.           Changes in Control of Registrant.

                  Not applicable.

Item 2.           Acquisition or Disposition of Assets.

                  Not applicable.

Item 3.           Bankruptcy or Receivership.

                  Not applicable.

Item 4.           Changes in Registrant's Certifying Accountant.

                  Not applicable.

Item 5.           Other Events and Regulation FD Disclosure.

                  Not applicable.

Item 6.           Resignations of Registrant's Directors.

                  Not applicable.

Item 7.           Financial Statements and Exhibits.

                  (c) Exhibits.

                  EXHIBIT
                  NUMBER       EXHIBIT TITLE
-------------------------------------------------------------------------------
                       99.1    Knight  Transportation,  Inc. press release
                               announcing  financial  results for the quarter
                               and six months ended June 30, 2004

Item 8.           Change in Fiscal Year.

                  Not applicable.

Item 9.           Regulation FD Disclosure.

                  Not applicable.

Item 10.          Amendments to the Registrant's Code of Ethics, or Waiver of a
                  Provision of the Code of Ethics.

                  Not applicable.



<PAGE>


Item 11.          Temporary Suspension of Trading Under Registrant's Employee
                  Benefit Plans.

                  Not applicable.

Item 12. Results of Operations and Financial Condition.

     On  Wednesday,  July 21,  2004,  Knight  Transportation,  Inc.,  an Arizona
corporation  (the  "Company"),  issued a press  release  (the  "Press  Release")
announcing  its financial  results for the quarter and six months ended June 30,
2004. A copy of the Press Release is attached to this report as Exhibit 99.1.

     The  information  contained in this report and the exhibit hereto shall not
be deemed "filed" for purposes of Section 18 of the  Securities  Exchange Act of
1934,  as amended (the  "Exchange  Act"),  or  incorporated  by reference in any
filing under the Securities Act of 1933, as amended, or the Exchange Act, except
as shall be expressly set forth by specific reference in such a filing.

     The  information  in  this  report  and  the  exhibit  hereto  may  contain
"forward-looking   statements"   that  are  made  pursuant  to  the  safe-harbor
provisions of the Private Securities Litigation Reform Act of 1995 and otherwise
may be  protected.  Such  statements  are made based on the current  beliefs and
expectations  of the Company's  management and are subject to significant  risks
and uncertainties. Actual results or events may differ from those anticipated by
forward-looking statements.  Please refer to the Company's Annual Report on Form
10-K  and  other  filings  with  the  Securities  and  Exchange  Commission  for
information  concerning  risks,  uncertainties and other factors that may affect
future results.



<PAGE>



                                    SIGNATURE

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                            KNIGHT TRANSPORTATION, INC.


Date: July 22, 2004                         /s/ David A. Jackson
                                            -----------------------------------
                                            David A. Jackson
                                            Chief Financial Officer


<PAGE>


                                  EXHIBIT INDEX

99.1                Knight  Transportation,  Inc.  press  release  announcing
                    financial  results for the quarter and six months  ended
                    June 30, 2004
[{"type": "8-K", "sequence": "1", "filename": "form8k.txt", "description": "KNIGHT FORM 8-K JULY 22, 2004", "secsgml_size_bytes": 5035}]
{"company-data": {"conformed-name": "KNIGHT TRANSPORTATION INC", "cik": "0000929452", "assigned-sic": "4213", "irs-number": "860649974", "state-of-incorporation": "AZ", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-24946", "film-number": "04926332"}, "business-address": {"street1": "5601 W BUCKEYE RD", "city": "PHOENIX", "state": "AZ", "zip": "85043", "phone": "6022692000"}, "mail-address": {"street1": "5601 W BUCKEYE RD", "city": "PHOENIX", "state": "AZ", "zip": "85043"}}
UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

                Date of Report (Date of earliest event reported):
                                  July 21, 2004

                           KNIGHT TRANSPORTATION, INC.
             (Exact name of registrant as specified in its charter)

          Arizona                    000-24946                 86-0649974
(State or other jurisdiction   (Commission File Number)     (I.R.S. Employer
     of incorporation)                                     Identification No.)

          5601 W. Buckeye Road, Phoenix, Arizona           85043
         (Address of principal executive offices)        (Zip Code)

               Registrant's telephone number, including area code:
                                 (602) 269-2000

                                 Not applicable
          (Former name or former address, if changed since last report)
Item 1.           Changes in Control of Registrant.

                  Not applicable.

Item 2.           Acquisition or Disposition of Assets.

                  Not applicable.

Item 3.           Bankruptcy or Receivership.

                  Not applicable.

Item 4.           Changes in Registrant's Certifying Accountant.

                  Not applicable.

Item 5.           Other Events and Regulation FD Disclosure.

                  Not applicable.

Item 6.           Resignations of Registrant's Directors.

                  Not applicable.

Item 7.           Financial Statements and Exhibits.

                  (c) Exhibits.

                  EXHIBIT
                  NUMBER       EXHIBIT TITLE
-------------------------------------------------------------------------------
                       99.1    Knight  Transportation,  Inc. press release
                               announcing  financial  results for the quarter
                               and six months ended June 30, 2004

Item 8.           Change in Fiscal Year.

                  Not applicable.

Item 9.           Regulation FD Disclosure.

                  Not applicable.

Item 10.          Amendments to the Registrant's Code of Ethics, or Waiver of a
                  Provision of the Code of Ethics.

                  Not applicable.
Item 11.          Temporary Suspension of Trading Under Registrant's Employee
                  Benefit Plans.

                  Not applicable.

Item 12. Results of Operations and Financial Condition.

     On  Wednesday,  July 21,  2004,  Knight  Transportation,  Inc.,  an Arizona
corporation  (the  "Company"),  issued a press  release  (the  "Press  Release")
announcing  its financial  results for the quarter and six months ended June 30,
2004. A copy of the Press Release is attached to this report as Exhibit 99.1.

     The  information  contained in this report and the exhibit hereto shall not
be deemed "filed" for purposes of Section 18 of the  Securities  Exchange Act of
1934,  as amended (the  "Exchange  Act"),  or  incorporated  by reference in any
filing under the Securities Act of 1933, as amended, or the Exchange Act, except
as shall be expressly set forth by specific reference in such a filing.

     The  information  in  this  report  and  the  exhibit  hereto  may  contain
"forward-looking   statements"   that  are  made  pursuant  to  the  safe-harbor
provisions of the Private Securities Litigation Reform Act of 1995 and otherwise
may be  protected.  Such  statements  are made based on the current  beliefs and
expectations  of the Company's  management and are subject to significant  risks
and uncertainties. Actual results or events may differ from those anticipated by
forward-looking statements.  Please refer to the Company's Annual Report on Form
10-K  and  other  filings  with  the  Securities  and  Exchange  Commission  for
information  concerning  risks,  uncertainties and other factors that may affect
future results.
SIGNATURE

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                            KNIGHT TRANSPORTATION, INC.

Date: July 22, 2004                         /s/ David A. Jackson
                                            -----------------------------------
                                            David A. Jackson
                                            Chief Financial Officer
EXHIBIT INDEX

99.1                Knight  Transportation,  Inc.  press  release  announcing
                    financial  results for the quarter and six months  ended
                    June 30, 2004