Originally Posted by
canadiancow
My advice is to wake up in time to catch the earlier SFO-YYZ flight, and check 737 (738's inbound) is on time. If so, you're probably good. If not, get to the airport

Well, it's B763 we are talking about here, it can break down at any time. For all of my three MXed 763 flight in the past 12 month, the inbound had no problem.