Just because I brought it up:
Continental Flight 11———May 22, 1962-——Boeing 707——Dynamite bomb in a lavatory by suicidal asshole.
Security at US airports is lax. Even worse in th middle east (except Israel).
If you have airport employees, cops, military, etc., that share beliefs with those who will strap bombs and detonate them for the cause, anything can get “overlooked”.
On the other-hand, a report from the airport where this aircraft overnighted says maintenance was ongoing all night, and it wasn’t signed off as “Approved for Return to Service” until shortly before the flight. Routine overnight checks, or something else?