Knight Transportation, Inc. (NYSE: KNX) announced today that Kevin Knight, Chairman and Chief Executive Officer of Knight Transportation, Inc., is scheduled to present at the William Blair Growth Stock Conference in Chicago, Ill., on Thursday, June 11, 2009, at 11:20 a.m. CDT.

Knight Transportation, Inc. is a truckload carrier offering dry van, refrigerated, drayage, brokerage (on highway and rail) and dedicated 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. Knight provides high service levels to a diversified base of full-truckload shippers across a broad range of industries and freight types.

The presentation or discussions at the conference may contain 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. Please refer to various disclosures made by the Company in its stockholder reports, press releases, and filings with the Securities and Exchange Commission for important risks and uncertainties that could cause actual results or events to differ materially from those expressed in or implied by any such forward-looking statement. The Company does not assume, and specifically disclaims, any obligation to update forward-looking statements.

Knight Transportation, Inc., Phoenix
David Jackson, Chief Financial Officer, 602-269-2000