To check airline miles balances online, log in to the airline's mileage program through the airline website. Each airline has its own program for accruing airline miles and using them for perks while traveling. Some mileage programs that are affiliated with credit card companies allow users to check mileage balances through the credit card's website. To log in to a mileage account, users need either a member number or user name and password or personal identification number.
In order to accrue airline miles or points, travelers have to sign up with the airline or through a participating credit card for an account. To sign up for an account, travelers must provide basic information including name, phone number, address, birth date and email address.
Travelers can accrue miles by booking travel with the airline or partner services, such as hotel or car rental agencies, or by making purchases with an associated credit card. Miles are redeemable for air travel, hotel stays, car rentals, air travel upgrades and other perks that may vary by airline program. Miles are usable in some programs to move into higher levels of the program that entitle the traveler to increased benefits and more opportunities to use and accrue airline miles.