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?
Would like to be a fly on the wall at Airbus HQ. You know they are hoping this is not a fault of the aircraft.
Still it could be. I can imagine how the Boeing folks who worked on that JAL 747 felt with it going down with the huge pax load.