MONTREAL AND TORONTO — A tentative deal reached hours ahead of a strike deadline by the Air Transat pilots union prevented the chaos of a holiday-adjacent work stoppage but came too late for some passengers whose flights had been cancelled as a precautionary measure.

The airline had announced a fresh round of flight cancellations Tuesday afternoon as the clock ticked down on a Wednesday morning strike deadline.

Travel company Transat A.T. Inc., which owns the Montreal-based leisure airline, said it had cancelled a dozen flights, plus another half-dozen scheduled for the next day.

The cancelled trips included sun destinations in Mexico, the Dominican Republic, Peru and Spain as well as London and Paris. All 18 flights were slated to either take off or land in Toronto or Montreal.

Air Tr

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