From hours at security to bulletproof cockpits: How 9/11 changed air travel

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- Sept. 11 represented a new kind of national security threat, and a new national security architecture was created to confront it.
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- The individual has not yet been avowed — the formal process in Britain by which an intelligence or security figure’s identity is publicly acknowledged — as routine security considerations are still being worked through.
- One of the biggest changes to US aviation travel was the Aviation and Transportation Security Act (TSA).