Airline fees are additional charges that airlines impose on passengers beyond the base ticket price. These fees can include costs for checked baggage, seat selection, and in-flight meals. They vary by airline and can significantly increase the total cost of travel, making it important for travelers to review the fee structure before booking. Many airlines offer different fare classes, which may include varying levels of service and associated fees. For example, a low-cost carrier might charge for every extra service, while a full-service airline may include some amenities in the ticket price. Understanding these fees helps passengers budget effectively for their trips.