Overbooking is a calculated revenue management strategy used by airlines to minimize the financial loss from "no-shows" and last-minute cancellations. Historical data shows that on almost every flight, a small percentage of passengers will fail to show up due to missed connections, illness, or changed plans. Since an empty seat is a "perishable" asset that cannot be sold once the plane takes off, airlines sell more tickets than there are seats to ensure the aircraft is as full as possible. This practice helps keep base ticket prices lower for all passengers by maximizing the airline's "load factor." When the gamble fails and everyone shows up, the airline must offer compensation—such as travel vouchers or cash payouts—to volunteers who agree to take a later flight, which is often still cheaper for the airline than flying with empty seats daily.