I seriously doubt even if it was legal to carry a firearm on a commercial aircraft that any airlines would actually permit it. Could you imagine how much revenue Southwest would lose if Bubba accidentally shot a hole in the fuselage of a $150,000,000 Boeing 767? That's a HUGE risk for their insurers and I'm sure it would never be permitted.
Personally, I have no desire to be stuck in a metal can, flying at 450 knots, 30,000 feet above the Earth with someone packing a gun. I'm a firm believer in the right to carry, but I feel there are situations where the safety of others around you trumps that right.
Hk USP 45 Expert, USP 40, USP 9, SIG P226, S&W M&P9, Hk 4, Makarov, Desert Eagle 40, Beretta FS92 Centurion, Kimber TLEII 1911A1, Glock 22, SIG P225, 1943 Rem Rand 1911A1, S&W mod 64, Walther PPQ, SIG P229, Browning BDA 45 (SIG P220), Hk45, SIG P230