BWI (Baltimore)
MAF (Midland, Tx.)
Southwest Airlines
Zero issues, filled out the red/white tag, locked it in the small Pelican case with my pretty pink Masterlocks, stuck that inside my TSA locked large soft-sided suitcase and away it went.
In Midland the check in agent didn't even glance at my gun or ammo.
In Baltimore they were more interested in verifying my ammunition was in a proper container than they were in the pistol.
Now the $125k Flir Infrared camera packed inside a large (just under the carry on max size) Pelican case that I carried on... that confused the heck out of the BWI TSA.
I doubt they've ever seen one before and they were very nervous about handling it.
A TSA supervisor hand carried and hand inspected it when I told them what it was and how much it cost.