Air Canada flight attendants hold a silent protest at Montreal-Pierre Elliott Trudeau International Airport on Monday.

Air Canada is set to begin pre-emptively cancelling flights ahead of a Saturday deadline for a potential strike, throwing a wrench into travel plans, connecting flights and long-awaited summer excursions. It also raises the question of whether passengers are owed more than just refunds and rebooking onto alternative flights.

The union representing 10,000 Air Canada flight attendants issued a 72-hour strike notice on Wednesday. The airline responded with a lockout notice shortly thereafter.

Air Canada also stated that it would gradually cancel flights leading up to the strike deadline this weekend, with the first flights cancelled Thursday and more on Friday.

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