I have no idea dude but the Port Authority police record that info for every gun that leaves the city. I've yet to have a problem with any of those guys.
Most of these airlines are simply making up rules as they go along, and as Southnarc noted, individual gate agents who do not like guns will often become problem children. I wonder how the airlines would handle agents who have a personal dislike of say "people who wear a hijab" and went out of their way to be rude and hinder the travel of those wearing hijab's.
I always get to the airport really early to ensure no problems. What kills me is when some issue comes up and you are at the gate for over an hour and nobody calls or pages you.....American Airlines.
One thing I've noticed with Delta is that the higher your status is in their loyalty program the less you get fucked with by them on anything. Another reason to fly airline monogamous.