How are we going to screen our pilots? Or the pilots from other countries who are flying around on international flights?
If they have good screening of pilots, background checks, etc thats fine.
As far as cowboys go, I think having a few in the back seat is just as effective as having a few in the front...
I think that idea of plain clothes marshals is a good one. Terrorist would never know, who they were or how many there were. The terrorist could be certain of one thing. There are trained and armed pilots in the cockpit.