Originally Posted by
Repooc17
There are three concourses in Terminal B, and none of them are connected airside.
UA provides an airside bus which stops at terminal B (from terminal C) for 60s gates only. Alaska Airlines has been using 40s gates.
DO NOT suggest using the airside bus for AS flights. There was a time AS flights would rotate between all three concourses in B, but it seems AS is now exclusively using 40s gates.
Yes, that's right, and I forgot about the security B configuration and airline changes. If the OP is in C airside for the UA lounge, he/she still has to get to B. Chances are there will be no problem with the Air Train but I've been on it when it stopped mid-station and the AC stopped, not pleasant and so avoid it possible. My preference would be to walk.