Re: Foolproofing the world's aircraft
As in my previous post I defined foolproofing as an inherent design feature that prevents the machine from being used improperly. Here's another idea:
The interiors of aircraft could be designed to eliminate recesses and crannies where a weapon could be hidden or affixed. Such areas would include underneith seats or carry-on baggage stowage racks. For example plastic casements wrapped around the underside of a chair will prevent things from being put underneith. Removing doors or making luggage racks see-through might work in that case.