A complete shutdown will impact about 130,000 people a day, and some 25,000 Canadians a day may be stranded abroad.

The 10,000-strong union said it would remain on strike, calling the order unconstitutional and designed to protect airline profits.

Air Canada suspended plans to resume flights Sunday after striking flight attendants refused a government order to return to work. “All Air Canada and Air Canada Rouge flights are cancelled due to ...