TORONTO — Air Transat passengers face a second day of uncertainty, as the airline could suspend all flights by the end of the day as it prepares for a possible strike.

The Air Line Pilots Association, which represents 750 pilots at Air Transat, issued a 72-hour strike notice over the weekend.

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

The leisure airline flies tens of thousands of passengers on more than 500 flights each week to mainly sun destinations in the Caribbean, Mexico and Europe.

It scheduled four additional flights on Monday to bring back passengers who were initially scheduled to return Wednesday but worried they could be strande

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