Tedski, I highly doubt either UA or AA will ever go for the A330, or A340. UA was the launch customer for the 777, and I highly doubt that they will be switching and entire aircraft type, merely for the engines.They have too much of a stake in the 777, owning the worlds largest fleet of them, to go adding a whole new type of aircraft. It would be more costly to switch aircraft than service different engines. You have to have different maintenance equipment, different maintenence training, different flight training, different facilities. It changes too many things to change aircraft.
Yes, AA did put up a fuss about the 777LR and its GE engines, but I will bet you money they will go for the 777LR. If I recal correctly, BA was an all RR airline, but they were the launch customer for the GE engines on the 777.
"Bangkok Tower, United 890 Heavy. Bangkok Tower, United 890 Heavy.....Okay, fine, we'll just turn 190 and Visual Our Way