Thanks for your replies. Unfortunately, It will cost me too much $$ to make changes to my itinerary, so I think I'm going to risk it. I have an RBC Avion Visa so I'm fully covered with all sorts of travel insurance.

Also, the other good news is that for some reason, flight UA7860 from YOW - IAD has been arriving early (anywhere from 10 - 30 minutes) almost every day for the past couple of months with a couple of exceptions according to flightstats.

Really, the only thing I'm nervous about is my luggage!

will keep you posted on my adventure!

Wayne