Air Transat has cancelled 12 additional flights on Tuesday and Wednesday, on top of the six previously announced, amid down-to-the-wire talks with its pilots’ union to avert a walkout that could begin at 3 a.m. on Wednesday.

The Montreal-based airline said Tuesday afternoon that it had made improved offers, along with significant concessions, over the past few hours, with less than 14 hours remaining for both parties to reach a deal.

“In the absence of an agreement at this time, we are compelled and regret to proceed with the cancellation of a second wave of flights scheduled for today,” Air Transat said Tuesday.

The announcement came after the airline cancelled six Tuesday flights earlier in the day.

The 18 cancelled flights in total include routes between Toronto and Montréal and

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