Update: All 3 Air Canada (Canada-bound) flights today (Sunday May 7) are now en route, and all three are delayed:
AC26 to Vancouver new ETA 11:50 AM PT (2:50 PM ET)
AC18 to Montreal new ETA 7:02 PM ET
AC28 to Toronto new ETA 8:04 PM ET
Based on the flights WindsorSue put in the transportation thread, I'm thinking they are going to Toronto and then make their way to their next destination. I doubt its Montreal.