you are correct! although it doesn't work ex:LAX, IAH, YVR, LAS, MIA, MCO, PHX, SAN, SEA but does from JFK, SFO, ORD, YYZ, TPA, DFW, IAD, PHL, BOS
It only works for GIG not GRU or EZE
I guess most people would go for the AA direct rather than go trans-atlantic twice when you don't need to at all...but this is FT and I think I have just found my next miles saving trip!!!