Originally Posted by
eponymous_coward
SJC was such a profitable tech hub that AA piddled it away into irrelevancy in their network, and they are the the best airline in the US at generating premium revenue and traffic.
AA is definitely the best at generating premium revenue and traffic. However, AA also has the highest cost structure. Their cost structure, together with their desire to have a true hub, prevented AA from making money at SJC.