I travelled with my gun on a commercial air carrier for the first time last weekend. I knew it was legal and all, but was still a little nervous, what with today's security climate. I told my wife on the drive to the airport that we might have a little delay at the ticket counter since I was intending to declare a handgun in my checked bag; she about hit the roof! But I assured her that I was in compliance with all the rules and there should be no problem, and that's exactly what it was.
The unloaded KelTec P11 was secured in a locked LifeJacket and the ammunition was packed separately in a factory ammo box. I declared it to the ticket agent, he had me sign a bright red string tag and told me to open the bag and lay the tag on the very top, then take the bag to the TSA security screener. The screener didn't even open the bag after I told him that a gun was inside. The bag went through and we headed for the gate. Same deal for the return flight.