Haven't most foreign countries privatized their air travel security? I'd be okay with letting the airline companies take care of their own security. If it was me I'd make sure nobody could get into the pilot cabin, and they could have surveillance cameras to immediately see any disturbances in the passenger area and take the appropriate actions. If the pilot needs to pee? Give 'em an empty coffee can.
Before 9-11 it was private companies that handled security for the airports.
It was the Clowns in DC that decided to make them all Fed Employees.
Isreal did the same thing but then went back to private companies running the security.
EL Al is probably the safest airline on the planet.