I have some related questions. I'm scheduled to fly in to IAD from NRT on NH in C (possibly F, depending on whether my upgrade goes through) with a three hour connection to RIC in Y (single-class aircraft). I was hoping to get a shower at the LH lounge on the B concourse, though my flight (on AX) is likely to depart from the A concourse (I've seen A1 as a gate used in the past...).

1a. How difficult is it to get from midfield C&I back to the B concourse lounges?
1b. Would it make more sense to go through the main C&I and return to the B concourse instead?
2. Would I have access to the UA IFL if I was arriving in international F?
3. What's the easiest way to get from the LH lounge to the A gates? I know it's a long walk, but it's been a while since I've been at IAD and I'm not sure if the AeroTrain has made this easier.

Thanks in advance.