This technique is known as "the fruit loop" and saves the conspiracy theorist from ever having to see any of their ideas through to their (ill)logical conclusions. According to the practitioners of the fruit loop, 19 Arabs took over the 4 planes by subduing the passengers and crew through the use of guns, knives, box cutters and gas, and then used electronic guidance systems which they had smuggled on board to fly the planes to their targets.

The suspension of disbelief required for this outrageous concoction is only for the hard core conspiracy theorist. For a start, they conveniently skip over the awkward fact that there weren't any Arabs on the planes. If there were, one must speculate that they somehow got on board without being filmed by any of the security cameras and without being registered on the passenger lists. But the curly question of how they are supposed to have got on board is all too mundane for the exciting world of the conspiracy theorist. With vague mumblings that they must have been using false ID (but never specifying which IDs they are alleged to have used, or how these were traced to their real identities), they quickly bypass this problem, to relate exciting and sinister tales about how some of the fictitious fiends were actually searched before boarding because they looked suspicious.

However, as inevitably happens with any web of lies, this simply paints them into an even more difficult corner. How are they supposed to have got on board with all that stuff if they were searched? And if they used gas in a confined space, they would have been affected themselves unless they also had masks in their luggage. "Excuse me sir, why do you have a boxcutter, a gun, a container of gas, a gas mask and an electronic guidance unit in your luggage?" "A present for your grandmother? Very well sir, on you get." "Very strange", thinks the security officer. "That's the fourth Arabic man without an Arabic name who just got on board with a knife, gun or boxcutter and gas mask. And why does that security camera keep flicking off every time one these characters shows up? Must be one of those days I guess..."