Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Comen Thomas Casey
 2. Date of Event Requiring Statement (Month/Day/Year)
05/26/2005		 3. Issuer Name and Ticker or Trading Symbol
KNIGHT TRANSPORTATION INC [KNX]
(Last)
(First)
(Middle)
5601 WEST BUCKEYE ROAD		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
Executive Vice President
 5. If Amendment, Date Original Filed(Month/Day/Year)
05/27/2005
(Street)

PHOENIX, AZ 85043		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock, par value $0.01 per share 156
I
401(k

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (Right to Buy) 03/01/2007(1) 02/28/2014 Common Stock, par value $0.01 per share 37,500 $ 16.5467 D  
Employee Stock Option (Right to Buy) 05/16/2007(2) 05/15/2015 Common Stock, par value $0.01 per share 5,000 $ 23.3 D  
Employee Stock Option (Right to Buy) 03/01/2006(3) 02/28/2015 Common Stock, par value $0.01 per share 10,000 $ 27.13 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Comen Thomas Casey
5601 WEST BUCKEYE ROAD
PHOENIX, AZ 85043		       Executive Vice President

Signatures

/s/ Casey Comen 04/14/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This option will vest in five equal annual installments on March 1, 2007, 2008, 2009, 2010 and 2011.
(2) The previously reported vesting schedule contained a typographical error. The correct schedule for vesting is in 20% increments on May 26, 2007, May 26, 2008, May 26, 2009, May 26, 2010 and May 26, 2011.
(3) This option will vest in four (4) equal installments on March 1, 2006, March 1, 2007, March 1, 2008 and March 1, 2009.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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