[MichaelGG]

It seems the existential threat to an airplane remains the same: cockpit access. Note that in some areas, taxis have more security than an airplane, in the sense that there's no way to escalate from passenger to pilot (dividing wall).

Even today, I see pilots open the cockpit during flight to use the toilet. Usually, the FA blocks the passageway with a cart. It seems plausible to me that there's a short period of time that a well-trained ninja-like attacker could leave their first class seat, and obtain cockpit access.

But I guess it'd be too expensive to provide full pilot separation.

[VBprogrammer]

Millions of flights a year are conducted safely with this apparently lax security. Perhaps the pilots simply weight up the minuscule risk and rate urinating in their trousers as the greater inconvenience.

Back in the 90s I still remember the day when a kind flight attendant came to my seat and took me to the cockpit of the 767 we were flying to Florida in.

Back then aircraft were occasionally hijacked, they'd be forced to divert or land somewhere and some ridiculous demands made before, more often than not, everyone was allowed to go home unhurt.