You have the basic criteria correct. This varies from airline to airline. Some have limits on the amount of guns/ammo, others say ammo and gun in separate bags, some say hard-cases, etc.
Here's the basic rundown not including any changes the FAA is coming up with as we speak:
[url]http://www.angelfire.com/az2/zr1/firearmtravel.html[/url]
Individual airports [b]are[/b] going above that. Such things as searching any car that arrives at the airport, requiring photo ID before even entering any part of the airport ticketing area, etc.
In addition to calling the airline 3 times and taking the best 2 out of three answers you get, call the airport once and ask if there's any special guidelines they desire.
Airline workers generally aren't gun nuts, so don't be surprised if you get a lot of blank stares. And some airline's policies are a bit different from others. One airline asks that their workers "inspect" the firearm (dumb, dumb, DUMB!) while other airlines specifically tell their workers never to handle a passenger's firearm or even ask to see it unless there's a different reason (maybe there's a sound coming from the bag, etc.)
- Robbie