Visit your airline's website to fill out an online application to become a frequent flyer mile member. Click on the link to your airline's frequent flyer mile program, which goes by a different name on each airline, to begin filling out your application.
Provide your airline with your name, address, age, email address and your contact information. Create a user name and a password. Minors are allowed to carry frequent flyer mile club memberships.
Read the terms and conditions of membership, you should never sign any document, frequent flyer mile program or not, without first reading the fine print and the terms and conditions. If you accept the terms, click the box to accept and submit your application.
Keep your confirmation page, which has your frequent flyer mile club number on it. Provide this number each time you book a flight through your airline to receive the miles from it.