Yes, another lounge access question!!
 

I have a routing this weekend on AA, IAD-ORD-MEX. According to the AA web site, MEX is considered the only international destination within N America where one is allowed lounge access based on AA PLT/EXP status. OK so far, but since BA has a lounge at IAD as well, what is the consensus that I can use the BA lounge at IAD?

Aren't you also QF WP/SG? If so why bother with the AAdv status?

Not yet. I am starting with these flights. But, I won't know the answer as both the AA and BA lounges were closed today while I was waiting for my flight.

Another option, at least for the reutn or next trip, maybe - at MEX, the American Express Centurion Lounge is landside, very handy for arrivals (or if you arrive at Benito Juarez Intl. early.) You can use it if you have AMEX Gold or above.

I am clueless about BA at IAD, but no harm in giving it a try... ;)