I do question the part about flying the plane into the US embassy. From the air, it would be hard to find. You need a good target...which is why the twin towers (sticking up on the south end of Manhatten) and the Pentagon (go down the river and aim slightly south when you see the large pentagonal building) were hit, and the Pennsylvania plane would have probably hit the US Capitol, not the whitehouse, which is hard to see from the air...
I haven't flown over London so what do you guys who fly to Europe guess was the target?