Ottawa (YOW) still has US pre-clearance. Like you, we will be driving to YUL for our Feb cruise out of Fort Lauderdale as well, although I have not yet booked our flights. The only direct non-stop YOW flight is Air Canada Rouge - done them, don’t want to again. I haven’t booked flights yet as once airlines started flying again Air Canada filled their schedules with far too many flights that were not likely to fly. I think they scheduled a bunch just to see which flight times most people would like, then cancel the others. Since I started keeping an eye out on flights on this route they have already deleted some flights. So far the flights I’m preferring are still there so I’d better book them soon before the prices go up.