Southwest Rapid Rewards members can receive up to 40 percent off and double credit with Avis rentals of three days or more until June 30, 2009. The offer is valid for all car groups at any Avis airport location in the U.S. and other restrictions may apply. Book online at Southwest.com or Avis.com or call Avis at (800) 331-1212. When booking, input K024710 in the Corporate/ID Rate field and be sure to provide your Rapid Rewards account number. Southwest is also currently offering deals with Alamo, Budget and Dollar offering between 25-40 percent off and up to triple Rapid Rewards credit.