John - It is possible, but it involves much training, and many participants. It wouldn't surprise me to see at least 3 - 4 terrorists on each flight working in tandem.
The training had to be intensive and detailed to work on 4 separate flights. You of all people should recognize military work at hand.
And where there is trainers there is witnesses, cooks, people who own land and homes, and people nearby who know of their existence. [b]100%[/b] of those involved must pay the piper.
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