MONTREAL — Air Transat passengers face the prospect of flight suspensions this week as the leisure airline prepares to wind down operations ahead of a Wednesday strike deadline from pilots.

Travel company Transat A.T. Inc., which owns the carrier, said cancellations would ramp up ahead of a potential work stoppage that could begin as early as 3 a.m. eastern time on Wednesday.

No Air Transat flights had been called off as of midday Monday, according to the airline and plane tracking platform FlightRadar24. But it had scheduled four additional flights for the day to bring back passengers initially scheduled to return Wednesday who were worried they might be stranded abroad amid the labour dispute.

The Air Line Pilots Association, which represents 750 pilots at Air Transat, issued a 72-hou

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