Continental Airlines is bringing back its recurring Mileathon promotion where members can earn bonus miles for completing qualifying activity. Register online at continental.com/mileathon by Feb. 28, 2011 and complete credit-earning activities, including online flight booking, hotel stays, car rentals and other partner activity. You will earn credits for each eligible activity and the more credits you earn, the more miles you will collect at the end of the promotion, April 30, 2011.

Plus, the member who earns the most credits will receive a Grand Reward that includes a cruise package to a destination you choose between Barcelona, Spain; Los Cabos, Mexico or Las Vegas, Nev.; including first or BusinessFirst airfare and a $500 gift card. Only members residing in the 48 contiguous U.S. can participate in the Mileathon promotion and you must register before completing activity to start earning credits.