frequent flyer program

program offered by airlines which allows passengers to earn points toward free airline tickets (points are awarded for each flight traveled)

A frequent flyer program (FFP) is a service offered by many airlines to reward customer loyalty. Typically, airline customers enrolled in the program accrue points corresponding to the distance flown on that airline. Accrued points (also known as frequent flyer miles) can be redeemed for free air travel; for other goods or services; or for increased benefits, such as airport lounge access or priority bookings.
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