1. Fly Frequently
Join the AAdvantage program - all that's required is some personal information to make an account. Frequent flyer miles include flying, buying gift miles, renting cars through AA, and reserving hotel rooms.
2. Get Plastic
Apply for the Citi / AAdvantage platinum card and not only earn bonus frequent flyer miles with purchases, but other advantages including a free checked bag (for up to four additional flyers on the itinerary), Grou 1 boarding, 25% savings on eligible in-flight purchases, 10% of redeemed miles back, and double mile points on American Airline purchases. The card has a yearly fee of $95, which is waived the first year.
3. Get Social
Like them on Facebook or follow on Twitter for updates about promotions and bonus flyer mile programs.