Air Canada has canceled hundreds of flights — many of them international flights — as a potential strike by flight attendants looms.

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.

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.