I've flown (declared and checked) with firearms before, and I'm not too worried about the process, just curious about how this might play out in one of these scenarios.

While its perfectly fine to declare then check firearms and ammunition on a flight, you are still bound by local law when arriving final destination. Can this also be affected by a transit point, as many times the airport in question is not your final destination? Are you bound by local laws of the transit airport, or your final destination by rental car?

I've found the following on wikipedia http://en.wikipedia.org/wiki/Gun_law...ates_(by_state)

There is a federal law that should trump local law if traveling to a final destination where it is legal for you to have the firearm.

http://uscode.house.gov/uscode-cgi/f...20%20%20%20%20

Do you have any experience with traveling through an airport in cities/states with firearm restrictions? For example, say I was checking a handgun in NYC-JFK because my travel originated in a legal location (Say NH) and ends in a legal location (Say TX) as an example? Are there any major issues checking a handgun at JFK in this case? Has anyone ever done it?