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What does "open-jaw" mean???
There are two types of "open jaw" airline itineraries.
>> An "open jaw" at origin combines an outbound leg from point "A" to point "B" with return leg from point "B" to point "C." The "open leg," travelled by other means, is from point "C" to point "A."
>> An "open jaw" at destination combines an outbound leg from point "A" to point "B" with a return leg from point "C" to point "A." The "open leg" is from point "B" to point "C."
An "open jaw" itinerary qualifies for fares that require purchase of a "round trip" ticket. The legs flown on the airline typically include connections, but cannot have any planned stopovers. Additionally, most airlines require that the "open leg" be shorter than at least one, if not both, of the legs actually flown.
BTW, most airlines classify airports that serve the same urban area as "co-terminals" and treat them as though they are the same airport for purposes of fare requirements. An itinerary that arrives at Newark International Airport and depart from Laguardia Airport, for example, typically would not consitute an "open leg" because these both of these airports serve the New York/Newark area. Thus, a trip that combines a flight from Newark to Louisville with a return from Cincinnati to Laguardia would constitute a legal "open jaw" itinerary and thus would qualify for "round trip" fares.