National Emerald Club members can earn a free rental day after completing two rentals of two days or more of a mid-size or larger vehicle through Jan. 31, 2011. The offer is valid at participating National locations in the 50 U.S. and you will receive notification of your free rental via email one to two weeks after completing your second qualifying rental. Your free rental day is valid on a compact through full-size car through June 25, 2011 and you can use up to three free rental days on rentals longer than one day. According to the terms and conditions, taxes, surcharges and other fees may apply to your free rental. Registration in the One Two Free promotion is required at http://insideflyerus.wpengine.com/link/?2886 before making reservations.