"I don't understand, why would you want to go via T1 Domestic? T1 International to T3 goes through the FCC, but you would have to clear connections security."
Well, I just thought I would have to go back on myself....is there a way to get back and forth between T1 international and T3 international without going landside? Reason is that if I get bumped off the VS flight I can go back to T1 international to get the next BA one....