Originally Posted by
checkerboard
FWIW, flying IB out of GRU in late November 2021, I was directed to the LATAM lounge, despite the exit of LA from OneWorld. Would have thought all IAG airlines would share the same lounges at outstations... Pity that's not the case. (My experience has been that the LATAM lounge is a bit nicer than AMEX in GRU).
GRU-LHR a few weeks ago on BA metal BA ticket, directed to the LATAM lounge by the check-in staff (and access permitted).