Who were the pilots in the 9.11 attack?

The public 9.11 story says something about where pilots came from. I know nothing about whether or not the information about  the pilots in the public story is true or not.

Even though the attack was triggered by the February strikes emotions from the Iraq/Kuwait war probably had something to say.
During the Iraq/Kuwait war "allied forces" were allowed to use airbases in other countries in the Middle East. That could have been a motive for fabrication and for creating a wrong perception of the identity of the pilots in the 9.11 attack in revenge. 
I have no idea how it actually was.