I was fortunate enough to meet and talk to an American Employee that helped run the AAadvantage Program (American's frequent flyer program). He was saying that United and Delta were stealing all their business travelers and the only base they could strongly hold onto is MIA. He went on to say that only a few years ago New York used to be a cash cow for them and close behind was ORD and LAX.
His theory now is that they'll concentrate less on the business traveler and more on the casual flyer. "With our Oneworld advantage, we could cut our ties with JetBlue and compete directly with them, Spirit and Southwest."