UPDATED 08:25: WestJet says it faces a possible strike by its mechanics starting as early as Friday. According to the airline, the Aircraft Mechanics Fraternal Association has issued a strike notice that could mean a work stoppage as early as 5:30 p.m. (MT) on Friday.

The notice comes after the union called off its strike plans last week and returned to the negotiating table.

WestJet says that as a result, it has preemptively cancelled 25 flights between Thursday and Friday, affecting about 3,300 customers.

The airline cancelled dozens of flights last week before contract talks resumed.

Union members voted overwhelmingly to reject a tentative deal earlier this month and have voiced opposition to WestJet’s request for arbitration.

Updated to show that WestJet has begun cancelling flights.

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