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Both American Airlines and United Airlines are celebrating a milestone with their frequent flier programs.  Their programs turn 25 this year and both airlines are celebrating big. 

Earn DOUBLE AAdvantage miles for travel on published fares on all American Airlines, American Eagle or AmericanConnection flights now through November 15, 2006! That's right, double miles! To qualify for this great anniversary offer, register using the red register button below, then book your flight(s) on AA.com by May 31, 2006.

United's Mileage Plus® program continues to celebrate its 25th anniversary this time by seeing double. Earn double miles on all published-fare tickets booked on united.com between May 18 and May 31, 2006, and flown by Nov. 15, 2006.* Register today as registration is required prior to travel and before May 31, 2006.

You need to registar your frequent flier numbers with the airline before booking to earn the double credit. 

American Airlines register site

United Airlines register site

Hurry and Book by May 31, 2006.