Originally Posted by RangerNS

The backup plan is the next YYZ-YOW flight. 5 seats together will be more difficult, day-of.

If 5 staying together is important (a family, say, with 1 minivan in YOW) then I'd say don't risk it. If the group can split up (business team with different drives after you land), then sure, why not? Teach those without NEXUS a lesson by being left behind.