Air Canada began canceling flights Thursday ahead of a possible strike by its flight attendants that could impact hundreds of thousands of travelers. A complete shutdown of the country's largest airline threatens to impact about 130,

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.

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.