Originally Posted by
aerodark
I'm not sure that's true. LHR-CGK neither originates in nor travels to the US, but as a one-way flight search in aa.com I see this as the very first option:
AA 101 LHR-JFK
AA 6087 JFK-HKG Operated by Cathay Pacific
AA 6109 HKG-CGK Operated by Cathay Pacific
It does transit in the US and is in conjunction with an AA metal flight. Try finding it with an AA code crossing Europe and Asia only.