I'm looking at a connection that would have us fly in from YYJ on an CRJ. How is SFO for customs clearance? All previous trips have used SEA or YVR for US/CAN clearance.

We'd be transferring from a United flight to a US Airways flight, is the baggage interlined between these two carriers? And how long to get from Customs to the US Airways (domestic) section of SFO? Will 2hrs be a long enough connection?

Thanks.