Originally Posted by
UserMark
Thank you for the useful information about the A -> E airside bus. I had no idea this existed. What this means is that you can arrive in BOS in terminal A and then take the bus to the Priority Pass lounges / restaurants in B/C/E.
A is not connected airside to B/C/D/E.
The bus only goes from A to E, It'll be a very long windy walk from/to E to goto/from anything in B or C.