Southwest Airlines said it notified WestJet on Friday of its intent to terminate codeshare plans with the Canadian carrier.
The airlines were scheduled to implement the codeshare sometime this year.
The decision was not unexpected, as Southwest executive Bob Jordan two weeks ago said the codesharing pact was in jeopardy because WestJet was "making new demands that Southwest will not meet."
Jordan reiterated that on Friday, but did not say what WestJet's new demands were
"We prefer the existing terms of our agreement with WestJet," said Jordan, the airline’s executive vice president of strategy and planning. “Upon reviewing the number of changes that WestJet has requested, we have decided that it is in the best interest of both parties to move forward independently."
Southwest did not give a reason for the breakup, but WestJet’s reported interest in establishing a codeshare with Delta likely was a big factor.