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.

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

Air Canada cancelled more than 600 flights over the past two days in preparation for a potential work stoppage, and Hajdu says it could be days before service returns to normal.