Region of Waterloo International Airport - YKF

[plam]

That said, I don't know flight schedule patterns at SFO. Prehaps they follow some pattern analogous to eastern NA flights for European destinations that tend to leave late in the afternoon or early in the evening so as to arrive in the morning in Europe. I could see how an afternoon flight from YKF to say JFK might attract enough people who want to connect to European flights without them having to spend hours cooling their heels in a US-embargoed lounge. Is that also the situation with flights out of SFO?

The US does not do transit lounges. If you want to fly through the US, you have to clear customs. Since we don't preclear at YKF, you have to clear customs upon arrival. This, along with some other reasons, makes transitting through the US less than ideal for many people.