RJ already flies nonstop to JFK and ORD (edit: and DTW, but it's less relevant for connections) from AMM, so it's just a question of RJ's codeshares on HP and AC turning into AA and BA. MA flies into JFK and YYZ. Maybe AA would fly DFW-BUD to improve the connection potential between them and MA, but I don't see it being necessary. Seems like between ORD and JFK, RJ is well served.