The looming Air Canada flight attendant lockout has the potential to cause havoc to travel plans in Canada and America. Air Canada announced it will begin canceling flights Thursday in anticipation of the lockout,

The union defied a government order to return to work. The airline said it would delay plans to restart operations from Sunday until Monday evening.

After months of stalled negotiations, 10,000 Air Canada flight attendants walked off the job early Saturday morning. The federal government stepped in hours later to order binding arbitration, forcing an end to the strike — or so they thought.

As Air Canada cancels flights in anticipation of a possible strike, experts say this could result in millions of dollars of delayed claims.