Since it was brought up (and IMO, is a very valid point) that not all models of the 777 compete with all models of the A330/A340, and vice versa, I thought we could break it down a little. I have already posted the A340NG vs. 777LR numbers, which are direct competitors, so I won't rehash those. After that, the only other direct competitors are A330-300 vs. 777-200 and A340-300 vs. 777-200ER. A complete customer list of these models would be too long to list here, so I'll just post the total order numbers:
I hope that helps the discussion.
As Prebennorhom already mentioned, when looking at political pressure, it would be naive to look only at the U.S. side. I am certainly not going to say that U.S. politics have not played a role in Boeing orders (El Al, Vietnam, etc.). However, has it just been coincidence that every Airbus order from China has been announced at the same time the French president has been visiting? Also, one side that seems to always get lost is the negative aspect of U.S. politics. Do you think Iran Air will order Boeings in the forseeable future? Or Iraqi Airways? How about the coincidence that China Airlines reversed their LOI for 777s and ordered A340s when relations between Taiwan and the U.S. were very strained? This despite the obvious intense political pressure from the U.S. This is a very dangerous arena to get into, and I don't think either B or A supports would want to get caught in the middle.
I believe you're putting WAY too much emphasis on the value of engine commonality. Although a definite consideration for any puchase, being 1/4 the total price, engine selection almost always comes after the airframe has been decided on. IMO, it is ridiculous to consider that, say AA, would order a completely new airframe (A340NG), with all the associated costs of training and spares, just to have an engine with a common family heritage as their Trent 800s. I'm not saying there isn't a possibilty they won't (although I do consider it only .000001% probable), just that engine choice won't be the deciding factor. Also, remember that not only has ANA and JAL switched engines going from 777s to 777LRs, but Lufthansa, Virgin, EgyptAir and China Eastern are all going from GE to RR when chosing A340NGs to completment their current A340s.
All gave some. Some gave all.