The carriers expect that either one can check in passengers on the other's flight and that schedules will be adjusted for convenient connections.

Additionally, would become a distribution channel for WestJet flights, even before the connecting code-share is in place. Looking ahead, the carriers may decide to integrate frequent-flier programs, ground handling and cargo delivery, they said.

One difference between the two is that WestJet offers leather seats, increased legroom and live seatback television, so that in terms of comfort it is more akin to JetBlue ( JBLU) than to Southwest.

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