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.

The Canadian carrier said it was suspending its schedule and trying to get passengers booked with other airlines to limit disruptions. Hundreds of flights have been canceled since Thursday as part of what the airline described as a “phased wind down” of most operations. By Friday's end, it expected to call off 500 flights.

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