Airline miles programs, also known as frequent flyer programs, reward travelers for flying with a specific airline or its partners. Members earn miles based on the distance flown, ticket price, or flight class. These miles can be redeemed for free flights, seat upgrades, or other travel-related perks. Many airlines, such as Delta Air Lines and American Airlines, offer these programs to encourage customer loyalty. Members can also earn miles through hotel stays, car rentals, and credit card purchases, allowing them to accumulate rewards even when not flying.