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, Southwest.com 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.

If you liked this article you might like

Here's Why New York Area Airports Score Low With Travelers

American Airlines Is Totally in Love With Its Charlotte Hub - Here's Why

United Airlines Might Be Having an Identity Crisis That Is Worrying Wall Street

American, Spirit and United Get Downgrades as Ticket Pricing War Rages

Woman Sues Delta for Nearly $10,000 After Chomping on a Rock