Yes for flights to Central America Plat, Plat Pro, and EXP get Flagship lounge access regardless of what cabin you are in.
Get access if you’re departing on or connecting to a qualifying international flight marketed and operated by American or a
oneworldŽ airline (regardless of cabin).
Qualifying international flights
Flights between the U.S. and:
- Asia
- Australia
- Central America
- Europe
- Mexico City (MEX)
- New Zealand
- South America
Guest access
1 guest (children over 2 count as a guest)
Should probably be merged to
https://www.flyertalk.com/forum/amer...lagship+access