Knight Transportation Inc. Announces Upcoming Release of Third Quarter Earnings and Related Conference Call

PHOENIX--(BUSINESS WIRE)--On Wednesday, October 18, 2006, Knight Transportation, Inc. (“Knight” or “the Company”) (NYSE: KNX) will release third quarter earnings after the close of the market. Knight will be holding a live conference call with certain financial analysts to discuss the earnings release, the results of operations, and other matters on Thursday, October 19, 2006, at 4:00 p.m. ET. (Please note that, since the call will begin promptly as scheduled, you will need to join a few minutes prior to that time).

The public will be able to listen and participate in the conference telephonically by dialing 866-550-6338. An audio replay of the conference will be posted on the Company’s website for at least seven (7) days after the meeting (www.knighttrans.com/shareholders/audioarchive.cfm).

The Company assumes no responsibility to update any information posted on its Web site.

The conference may contain forward-looking statements made by the Company that involve risks, assumptions and uncertainties that are difficult to predict. Investors are directed to the Company’s most recent Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission, for a discussion of the risks that may affect the Company’s future operating results. Actual results may differ.