This is a touchy subject in some parts of the country, so I will comment in the vein of humour (so please laugh along with me if you've a mind to);
It's been a few years since I had to step onto an airplane, and at that time there were a few things you couldn't carry through security.... truely dangerous stuff like corkscrews, metal nail files, manicure scissors, or the large jug of Frappachino (unless you bought it on the other side of the screening area). Any liquids flammable or otherwise over something like 2 ounces (so no duty free bourbon), and I once got practically strip searched because I couldn't clear the metal detector until we discovered the metal shanks in my cowboy boots. Seriously I was down to the fillings in my teeth, the rivets in my jeans and the boots!
So with all the publicity about what is and is not allowed, and the posters, lists and advisories on websites and ticket counters, we are seeing this kind of stuff being shoved into folk's carry-on baggage...??? I'm thinking that along with better background checks on gun buyers, we need to take a good look at school transcripts too! I mean what kind of Einstein would think a loaded weapon is gonna be OK?
If you really feel the need to be armed when you get to your destination, just do what I do, find a swap meet or gun show and find the fella in the parking lot with the hand printed sign tucked under his windshield wiper that reads "cheap guns", and buy one outta the trunk. You can always dump it quick at any inner city McDonald's parking lot for almost what you paid (or more) just remember to unload it before the sale or it could end badly. 
Wear gloves and Travel Safe out there!