Great question and Robin Hayes hasn't called to ask me yet, but I think there's a slim chance of the E90 being out west again. I do think there is a greater chance of a CSeries base out west in 1-3yrs though...!

Initially I'll bet the main purpose of the new focus city will be just support the Mint transcons with planes, pilots, FAs, MX all in place in case something breaks or gets delayed. Eventually, I could see us adding some shorter haul routes out west and the Bay Area would be a good launch point.