When a flight is overbooked or "over capacity," airlines first seek volunteers to give up their seats in exchange for incentives such as travel vouchers, cash payments, or hotel stays. In 2026, these offers can sometimes reach as high as $10,000 for extremely overbooked flights on major carriers like United or Delta. If not enough people volunteer, the airline must perform Involuntary Denied Boarding (IDB), commonly known as "bumping." Passengers are selected for bumping based on criteria set by the airline, which often includes check-in time, the fare paid, or frequent flyer status (meaning "Basic Economy" passengers who checked in last are at the highest risk). If you are involuntarily bumped, you are legally entitled to monetary compensation under Department of Transportation rules, provided you have a confirmed reservation and checked in on time. In the U.S., this can be up to 400% of your one-way fare (capped at approximately $1,550) if the airline cannot get you to your destination within two hours of your original arrival. The airline is also required to provide a written statement explaining your rights and the compensation you are owed.