About 200 Air Canada flights are to the U.S., according to The Wall Street Journal. The strike comes as Canadians increasingly avoid the United States because of diplomatic tensions between the neighbors. With more Canadians taking vacations at home, Air Canada has seen extra pressure on domestic routes.

Summer travelers are facing uncertainty as the clock winds down on a possible strike by Air Canada flight attendants, which the airline said would force it to cancel almost all of its scheduled flights as soon as Saturday.

Air Canada's flight attendants went on strike Saturday, as the airline announced a complete shutdown of operations, creating summer travel chaos for its 130,000 daily passengers. Its full 700-flight daily schedule has been scrapped for Saturday.