Searched around but couldn't find an answer to this particular situation. I will be taking UA 340 from IAD to SFO. It is a three class 777 and I'm in business. I will then be connecting to a flight to Seattle. Connection time is 48 min.

So first question is: From my limited research it seems about half the time or a little more the plane parks at the Int terminal. Is 48min enough time to make it from the Int terminal to domestic? Can I do this without having to go back through security?

Second question is: Looking at the limited flight history the plane typically seems to arrive 15+ minutes late. On some days its over an hour and I would definitely miss my connection. There is a later flight to SEA that would give me a lot more connection time. Do I have any ability to get changed to the later flight without paying a change fee (this flight is a month away)? (Even maybe a sympathetic CSR if I explain the situation?)

Two notes (maybe important?):
1.These are upgraded flights using miles so Business on the IAD-SFO and First on the SFO-SEA

2. There has been a schedule change on my itinerary but it is an outbound leg - could this help at all?

Thanks for your help!