91. Overbooked Flights – when an overbooked flight is full, airlines will offer compensation to passengers to get off the flight.
If there are no takers, they will typically raise the rate, but eventually will involuntarily bump a passenger and pay the passenger a government-mandated amount of money.
It is possible to turn a profit if you can book cheap enough ticket on a likely-to-be-overbooked flight in advance, then actively try to get bumped off the flight by being one of the first ones to volunteer to accept the compensation for being bumped.
Some people have been able to get bumped multiple times on the same trip, allowing them to keep racking up money or vouchers from the airline.