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Denied Boarding: Glossary
A booking for transportation by air that the airline or its agents or servants represented to the passenger as having been accepted and registered.
Involuntary Denied Boarding
Refusal of the airline to carry a passenger on the flight on which the passenger holds a confirmed booking, although they presented themselves for check-in and boarding on time, except where there are reasonable grounds to deny them boarding, such as reasons of health, security, or inadequate travel documentation.
Passengers who are involuntarily denied boarding are entitled to prescribed compensation.
Voluntary Denied Boarding
Voluntarily giving up a confirmed booking on a flight, at the airline's request, in exchange for benefits offered by the airline.
Passengers who volunteer to be denied boarding are not entitled to compensation beyond what has been offered by the airline and accepted by the passenger.