In short, all the terrorists had to do was wait, and win.

What do you think would happen if, simultaneously at 3:52 pm, at one
hundred large airports, somebody dressed in arab garb flung off his
clothing and ran naked the wrong way through security shouting in
Arabic? No weapons, no threats, no bombs... It would be utterly trivial
to do.

Every passenger would bet rescreened, cellphones and watches would be
banned (because they could be used to coordinate such an "attack"), and
we'd come close to paralysis.

They have already won.

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
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