[bbanyc]

The pre-2001 airport security apparatus did a good job of keeping guns off planes, eliminating the most common hijacking scenario. Almost everything since then has been increased hassle for diminishing returns, with the most effective improvement being one of the least visible - hardening the cockpit doors.

[dwd]

Which introduced a different issue allowing incidents such as the Germanwings and EgyptAir crashes and maybe even Malaysian MH-370.