AP —

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, but already hundreds of flights have been called off since Thursday, leaving travelers stranded and scrambling during the busy summer travel season. By Friday’s end, 500 total flights were expected to be canceled.

Both the union that represents about 10,000 Air Canada flight attendants and the airline say disagreements over key issues, including pay raises, have brought contract talks to a standstill.

A complete shutdown of

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