I have an AA miles award reservation for HKG-ORD-JFK. If space on a direct flight opens up, I know I can switch to HKG-JFK without a fee since I am not changing O or D, but what about HKG-EWR? I would think so since JFK/LGA/EWR are coterminals but I want to check if anyone has done this and if a change fee was charged.