Frontier Airlines was the most likely of the 15 largest US carriers to bump people from flights in early 2023. A further 3,395 were voluntarily denied boarding and 2,442 were involuntarily denied boarding. The data covers domestic US flights and international flights that departed from the US, and doesn't include passengers who were involuntarily denied boarding for other reasons. These are how the 15 carriers rank in terms of the proportion of passengers involuntarily bumped, per ATCR data:Frontier Airlines Envoy Air Spirit Airlines PSA Airlines American Airlines Skywest Airlines Republic Airways Southwest Airlines Alaska Airlines Jetblue Airways United Airlines Hawaiian Airlines, Endeavor Air, Allegiant Air, Delta Air LinesFrontier says on its website that in the event of an overbooked flight, passengers who volunteer to give up their seats get "alternative travel accommodations" as well as a Frontier voucher. "It is our goal to find enough volunteers so that no customers are denied boarding involuntarily," the airlines says.

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Organizations: Frontier Airlines, Endeavor, Frontier, Travel, Department of Transportation's, of Aviation Consumer Protection, June's, Consumer, Airlines, Envoy Air, Delta Air Lines, Endeavor Air, Hawaiian Airlines, Frontier Airlines Envoy Air Spirit Airlines PSA Airlines American Airlines Skywest Airlines Republic Airways Southwest Airlines Alaska Airlines Jetblue Airways United Airlines Hawaiian Airlines, Allegiant Locations: Delta