Originally Posted by
T8191
If you're an International arrival on BA, you will indeed get an air bridge at Gate B-42/44 ... which will then lead you to the boarding dock for the mobile lounge ... which then drives you across the airfield from the B-gates to the IAB
Getting on the mobile lounge efficiently is the key at IAD, to minimise long lines at Immigration.
+1 for this - have made the mistake of heading to the back before now. These days ... I know where to stand!

I'm making the trip the same way as Xenole - 777 there and 380 back. Yet to reserve a seat coming back ...