Originally Posted by
1Aturnleft
Yes you'd be eligible for Admirals club access in Boston (BA lounge is in Terminal E which is a different terminal to where AA depart from). Just show your BA silver card on entry and you'll receive access. In addition you'll also be eligible for access at your transit city as I'm fairly certain there isn't a nonstop BOS-CUN service with AA
Actually, AA does offer a
seasonal BOS-CUN nonstop:
https://en.m.wikipedia.org/wiki/Loga...tional_Airport