A poster on another board, amid fulminations, has proposed something else.
Given that:
1) Many states have passed concealed-carry laws for firearms;
2) In general, "civilians" tend to be more responsible gun owners than police officers (why? ordinary people have guns because they like them; they practice with them a lot. For police officers, qualifying with a firearm is a once a year ritual (if that) and in between, practice time is taken out of either personal, off-duty time or time they should be on the street)
Therefore --
The airlines should allow anyone who's been issued a concealed-carry permit and taken a course in gun use aboard airplanes to board the plane with a concealed weapon, bypassing the checks to do so. Guns carried aboard planes should have Glaser ammo, which fragments on impact and is much less likely to damage the aircraft structure [a danger which is overblown, IMO]
Police officers [with ID] and military personne [with ID and qualification papers; qualification in smallarms only, please] should have the same privilege.
The original poster suggested that they should get a free ticket. Probably not; with the additional bark added to the security, the ability to bypass the magnetometer would be enough initiative to get me off my butt to get my concealed carry license. (They might offer an upgrade to first class, so as to be near the cockpit)
That would work. It means the only gun carriers on planes would have been checked to a fare-the-well, and, more important, would have some training. It also means any hijacker would generally get a warm reception; as I said, an upgrade to first class and permission to avoid the search would get my attention.
Closing the barn door after the horse is gone, I know.