TORONTO — Air Canada flight attendants gathered for simultaneous demonstrations outside airports in some major Canadian cities Monday as the clock ticked down toward a possible strike that could begin as soon as this weekend.

In what their union called a national day of action, members of the Air Canada component of the Canadian Union of Public Employees planned pickets at Montreal’s Pierre Elliott Trudeau International Airport, Toronto Pearson International Airport, Vancouver International Airport and Calgary International Airport.

In Toronto, hundreds of flight attendants in uniform began piling out of yellow school buses shortly before 1 p.m. ET, as they lined up in front of the departure gate entrances at Terminal 1 of Pearson airport.

They stood in silence looking straight ahead, w

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