Air Canada withdrew its financial targets for the year as a strike by flight attendants entered its third day, forcing the country’s largest airline to cancel about 500,000 flights.

The union representing Air Canada’s 10,000 flight attendants said on Sunday that it would defy the government’s back-to-work order and continue a strike that shut down Canada’s dominant carrier and se...

The CIRB directed Air Canada to resume airline operations and for all Air Canada and Air Canada Rouge flight attendants to resume their duties by 2 p.m. ET (1800 GMT), the airline said.