I live in Europe.
Looking trough the passenger lists on the planes, almost all of them was US citizens.
Found two german passengers (quick sweep)
Did only US citizens fly American Airlines, guess not.
I have worked in an airline company for years, and the lack of foreign peoples on these flights seems strange. Major airports. Few foreigners. Strange.
(I realise your question is probably rhetorical but..)
have a look here
http://www.sierratimes.com/03/07/07/art ... ight77.htm
most of the people "on the pentagon flight" (ie found dead at the pentagon, whether on the plane or planted after the missile hit I dont know) appear to be probable witnesses/people involved in some way with 9/11. Most where probably NOT aware of their involvement, but would have figured it out after the fact and asked too many questions. EG: (at raytheon drone facility)
2000 - bossman - hey bob, can you program a simulation airplane to hit the pentagon in this simulator we have here? we are running a millitary exercise. Bob- no worries
finished soon after
9/10/01 - bossman - hey bob, theres a conference on tommorow, here I booked you a seat on this flight , head down tomorow ok? bob- "sure"
9/11/01 bob- WHy does this flight path look so familiar? aaaaaahhhhh