8-K

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):

May 27, 2008

_____________________________________________________________________

KNIGHT TRANSPORTATION, INC.

(Exact name of registrant as specified in its charter)

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

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

(602) 269-2000

(Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[   ]	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
[   ]	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
[   ]	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
[   ]	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01	Regulation FD Disclosure.
	On May 27, 2008, Knight Transportation, Inc., an Arizona corporation (the "Company"), issued a press release announcing that its Board of Directors increased the Company's quarterly cash dividend and declared a quarterly cash dividend of $0.04 per share of common stock, an increase of 33%.  The dividend is payable to the Company's shareholders of record as of June 6, 2008, and is expected to be paid on June 27, 2008. A copy of the press release is attached to this report as Exhibit 99.
Item 9.01	Financial Statements and Exhibits.
	(d)           Exhibits.
	EXHIBIT NUMBER	EXHIBIT DESCRIPTION
	99	Knight Transportation, Inc. press release dated May 27, 2008, announcing quarterly cash dividend and an increase in the quarterly cash dividend

The information contained in this report (including Items 7.01 and 9.01) 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 (the "Securities Act"), 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" within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. There can be no assurance that future dividends will be declared.  The declaration of future dividends is subject to approval of the Board of Directors each quarter after its review of the Company's financial performance and cash needs.  Declaration of future dividends is also subject to various risks and uncertainties, including: the Company's cash flow and cash needs; compliance with applicable law; restrictions on the payment of dividends under existing or future financing arrangements; changes in tax laws relating to corporate dividends; and the deterioration in the Company's financial condition or results.  Please refer to the last paragraph of the press release and various disclosures by the Company in its press releases, stockholder reports, and 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: May 27, 2008	By:	/s/ David A. Jackson
		David A. Jackson
		Chief Financial Officer

EXHIBIT INDEX

EXHIBIT NUMBER	EXHIBIT DESCRIPTION
99	Knight Transportation, Inc. press release dated May 27, 2008, announcing quarterly cash dividend and an increase in the quarterly cash dividend

EX-99

KNIGHT TRANSPORTATION

ANNOUNCES INCREASED QUARTERLY CASH DIVIDEND

PHOENIX, ARIZONA  --  May 27, 2008   -   Knight Transportation, Inc. (NYSE: KNX) announced today that its Board of Directors has declared an increase of the company’s quarterly cash dividend to $0.04 per share of common stock.  Prior to this 33% increase, the company’s quarterly dividend had been $0.03 per share of common stock.  This quarterly dividend is pursuant to a cash dividend policy approved by the Board of Directors.  The actual declaration of future cash dividends, and the establishment of record and payment dates, is subject to final determination by the Board of Directors each quarter after its review of the company’s financial performance.

The company’s dividend is payable to shareholders of record on June 6, 2008 and is expected to be paid on June 27, 2008.

Knight Transportation, Inc. is a truckload carrier offering dry van, refrigerated, and brokerage services to customers through a network of service centers located throughout the United States.  As “Your Hometown National Carrier,” Knight strives to offer customers and drivers personal service and attention through each service center, while offering integrated freight transportation nationwide and beyond through the scale of one of North America’s largest trucking companies.  The principal types of freight we transport include consumer staples, retail, paper products, packaging/plastics, manufacturing, and import/export commodities.

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, relating to our quarterly dividend.  There can be no assurance that future dividends will be declared.  The declaration of future dividends is also subject to approval of our Board of Directors each quarter after its review of our financial performance and cash needs.  Declaration of future dividends is also subject to various risks and uncertainties, including: our cash flow and cash needs; compliance with applicable law; restriction on the payment of dividends under existing or future financing arrangements; changes in tax laws relating to corporate dividends; the deterioration in our financial condition or results, and those risks, uncertainties, and other factors identified from time-to-time in our filings with the Securities and Exchange Commission.

Contact:  David Jackson, CFO, at (602) 269-2000

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