 The union members had rejected an earlier tentative agreement and walked off the job Friday evening, even after Canada's Labour Minister ordered binding arbitration. Rudge says the union was shocked that the federal minister would get involved in a private matter, adding that we're not essential workers. WestJet says it has offered 23% over four years. The Labour Minister says he is looking at additional options. More flights could be cancelled. For NPR News, I'm Dan Karpinchuk in Toronto.