peetar,
You are going at this the wrong way. 21st century dude.
Bomb detecting machines and/or dogs. People can carry whatever they want on the plane including pocketknives, prescription drugs, unloaded guns and basically everything but its locked away in your bag - you wont need any of it due to the two options you have.
Flying coach is now when they drug you to unconsciousness like at the dentists. First class is when they strap you into upright gurneys like Hannibal Lector. Bathroom breaks are done at the business end of a shotgun.
You can triple the number of people per flight when packing in the coach passengers tight enough so the cost per ticket should drop too