TORONTO — More than 300 Air Canada flights, many of them international trips, have been canceled as the clock ticked closer Friday to a possible strike by flight attendants, leaving travelers stranded around the world and scrambling during the peak summer travel season.

The bitter contract fight between Canada's largest airline and the union representing 10,000 of its flight attendants escalated Friday as the union turned down the airline's request to enter into government-directed arbitration, which would eliminate its right to strike and allow a third-party mediator to decide the terms of a new contract.

Air Canada offers daily flights from Pittsburgh International to Montreal and Toronto.

“Regarding Air Canada, passengers should check with the airline before coming to the airport to

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