I don’t recommend signing up for all of the airline frequent flyer programs at once as there are sometimes sign-up bonuses you can get if you time your sign-ups appropriately. Here is a list of the sign-up pages for some various frequent flyer programs listed together for your convenience. Most US programs will allow children to join the frequent flyer programs at any age, but that isn’t always the case with some international programs.
Airline Frequent Flyer Programs
To start, I recommend signing up for the four programs: United Airlines, Southwest, Britsh Airways, and American Airlines.
