Is it possible, not proven, that an airline employee may have been involved with the planning of 9-11?

a href="http://www.fbi.gov/newyork/press-releases/2011/imam-from-trinidad-convicted-of-conspiracy-to-launch-terrorist-attack-at-jfk-airport" rel="nofollow"http://www.fbi.gov/newyork/press-release…/a