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

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 has suspended all its flights as a strike by cabin staff begins - a move the airline said will disrupt travel plans for around 130,000 passengers a day. The union representing more than 10,000 Air Canada flight attendants confirmed the 72-hour industrial action early on Saturday morning.