[header] How to enroll in a frequent flier program [title] Select an airline that offers numerous flights out of your nearest airport. [step] It's best to use a single airline for most of your flights so you want accrue mileage faster. It also will be easier to redeem miles if there are many flights to choose from. 
[title] Look at how many miles you must fly before you can redeem them for a free flight. [step] Choose an airline that doesn't require flying more miles than other airlines.