National Emerald Club members can receive a free car rental after completing two rentals between Aug. 10, 2009 and Jan. 31, 2010. There is no limit to the number of free rentals you can earn and the free rentals earned with this promotion are in addition to your Emerald Club membership benefits, including credits for free rentals or frequent flyer miles. Registration is required and if you sign up to receive emails, you will be halfway to a free rental. Plus, when you refer friends who sign up for the program you will receive one free rental day.Free rental days are valid from Sept. 17, 2009 through June 25, 2010. Visit http://insideflyerus.wpengine.com/link/?1739