Imaginethis, the F.B.I. C.I.A., and N.S.A. are o nthe ball and sharing intell when their analysts put it together in late summer of 2001 that the Al Qaida terror network is planning to execut an attack on multiple targets using civilian jetliners as weapons.
Acting o nthis intell they fan out and put proactive plans in motion to fill the four flights with a collection of very bad @$$es. Male and female operatives that are ready for freddy.
When the hijackers stand and move toward the cockpit and threaten the planeloads of seriously deadly intel operatives, the Terrorists in question are grabbed and restrained and put into boxes while the planes make their regular run.
When the planes get where they are going, the Terrorists are manhandled off the planes into black sedans and nothingmore is heard of them.