Corrected entry: Other than the sleeper, the only two people that know about the bomb are Hassan and Jaffa, with the hijacking of the plane being used as a smokescreen to allow Hassan to blow the bomb up over Washington D.C. We know that Hassan and Jaffa set the plan up for Jaffa to get captured so Hassan could hijack the plane. When you think about it none of this makes sense. If Hassan was going to detonate a nerve gas bomb over America and kill millions of people anyway there was no need to get Jaffa captured at all, just hijack the plane and carry out the bombing.
Bishop73
11th Oct 2017
Correction: Hassen's own men don't know Hassen's true intention, they truly believe Jaffa was captured. With Jaffa captured, they're easier to persuade to join the cause of hijacking the plane. It seems Hassen was unsure he could recruit men for a suicide mission and thus lies to his own men. It's not a ruse to fool the American government.
Bishop73