Frequent flyer miles are rewards earned by travelers when they fly with a specific airline or its partners. These miles accumulate based on the distance traveled, the fare class, and the airline's loyalty program. Travelers can redeem these miles for free flights, seat upgrades, or other travel-related benefits. Airlines often have loyalty programs that allow members to earn and use frequent flyer miles. Each program has its own rules regarding how miles are earned and redeemed. Members can also earn miles through hotel stays, car rentals, and credit card purchases, making it easier to accumulate rewards for future travel.