WestJet passenger jets parked at departure gates at the Calgary International Airport on Wednesday, May 31, 2023. THE CANADIAN PRESS/Jeff McIntoshWestJet passenger jets parked at departure gates at the Calgary International Airport on Wednesday, May 31, 2023. THE CANADIAN PRESS/Jeff McIntoshThe union representing 4,400 flight attendants at WestJet says it has issued 72-hour strike notice, paving the runway for a possible strike this weekend. The Canadian Union of Public Employees says the two sides remain far apart on key issues, and that the airline issued a 72-hour lockout notice after it was given strike notice. While serving strike notice does not guarantee flight attendants will hit picket lines, job action could begin as soon as Sunday at 12:01 a.m. MT if the two sides don't reach a deal.