The Canada Industrial Relations Board had declared the strike illegal earlier on Monday and ordered the striking flight attendants back on the job. But the union said it will defy this second return to work order, after an earlier one had been ignored. The earlier one also ordered the union to submit to arbitration.

Air Canada plans to resume flights later on Sunday, a day after the government issued a directive to end a cabin crew strike that caused the suspension of around 700 daily flights, stranding more than 100,