Canada’s largest airline now says it will resume flights Monday evening. Air Canada said in a statement that the union 'illegally directed its flight attendant members to defy a direction from the Canadian Industrial Relations Board.

Air Canada suspended plans to restart operations Sunday after the union representing 10,000 flight attendants said it will defy a return to work order.

Air Canada suspended its financial guidance through year-end, citing the impact of a strike by flight attendants that has caused the airline to scrap its entire flying schedule.