AirTran A+ Rewards members can earn double credits on flights between Baltimore and Boston through May 21, 2010. Plus, the double credits will count toward A+ Rewards elite status.

A+ Rewards members normally earn one credit for each one-way flight plus 0.5 bonus credit for each business class flight. During the promotion, members will earn two credits for each one-way flight between Boston and Balitmore (three credits in business class). One-way award tickets in coach start at eight credits so you would only need to fly twice roundtrip between Baltimore and Boston to have enough credits for a free flight.

Qualifying flights must originate in either Baltimore or Boston and registration for the promotion is required prior to departure at http://insideflyerus.wpengine.com/link/?2322 — The business class bonus does not count toward elite status.