[oceanview]

neither will work.

the bomber can make the explosive from something he has on his person (like shoes, or a contact lens cleaning solution kit), and just go into the lavatory to set it up. someone with a gun, even an air marshal, cannot stop that by shooting him. you would have to ban ALL carry on, no shoes, no purses, nothing.

[Fishrrman]

oceanview writes:
the bomber can make the explosive from something he has on his person (like shoes, or a contact lens cleaning solution kit), and just go into the lavatory to set it up. someone with a gun, even an air marshal, cannot stop that by shooting him. you would have to ban ALL carry on, no shoes, no purses, nothing.

This is probably coming, in due time! (only half-kidding)

Cheers!
- John (whose flying days are over)