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> Given that Airport security wasn't implemented until after (and because of) 9/11

You were confused because this belief was false.

As others said, security definitely existed, typically in the form of metal detectors and x ray scans. Planes had been hijacked since the 70s and that's when it started. 9/11 just ramped up security to very high levels.

> Given that Airport security wasn't implemented until after (and because of) 9/11

Wildly false.