The pelican is good to go with TSA. I have owned a couple, but have sold them. They do provide good protection and have certain attributes. However, I found the Kelispel alum case to be better for my needs. I believe they provide a bit more protection. The two reasons I sold my pelican cases is because I found them to have a bit too much flex when closing the case. This was not a big issue, but going in and out of airports and through customs, especially while traveling in Africa, it got to be a pain. It was much more convienent with a hard sided case. The number one reason I got rid of my pelican's was because they will not stand up on end. This was a deal breaker. Try to let go for a minute to grab a passport and down it goes. Generally you have other luggage and this issue is a pain. Plus, the older you get the more of a pain it is to keep bending up and down with backpacks on etc.
I spoke to the the pelicans rep at the shot show and he just dismissed it. In my travels to Africa, I see very few pelicans and in talking with others who I meet--usually while waiting for our gun cases, this is a known issue. In my groups of hunters who travel by air with guns, the pelican--for this reason is left at home if travel involves airplanes.
Food for thought, Steve