I went out last October (13th) and returned on Dec 8th, then went out again on Jan 4th and returned on 1st March. I checked in my headset but carried my flight bag with licence and logbook in. On arrival in LAX in October, all my luggage was x-rayed (x-raying after arrival...thats a new one!), but no one seemed to care that I had flight kit on me. I carried all my kit with me on a number of domestic flights (Maui, Detroit) and the only thing the security people seemed to worry about, was my shoes. In fact I had my shoes x-rayed about 5 times, (and I think they're starting to glow), but no one said a word about my flight gear.
Cheers
EA