Air Canada / Facebook. I have a theory about flight attendants’ labour victory over Air Canada (and the Carney government) this week. This unpaid labour was a focus of the negotiations between CUPE, the union representing 10,000 flight attendants, and Air Canada. Air Canada flight attendants on the picket line. The next time you board an Air Canada flight, thank your flight attendant for standing up for the rights of all workers and their families and communities.