I think AA/US won't at this point. That ship has sailed. This order is a fantasy order they will never, ever take full or possibly even partial delivery of. The only way is for a non scope airline like AS or JB or if (when) they get really desperate and try an IndyAir wanna be experiment and they will fail hard on that one. Their maniacal egos will drive them to try it anyway though. Rich people must play with airplanes no matter how much they will lose doing it.