Boy, I didn't intend for my original post to detour into an attack on TSA. I have flown a dozen times a year, mostly domestically, but usually once a year internationally. I have traveled with camera equipment in my carryon every time but never a long lens. During this trip, TSA was most definitely focused on swabbing the 100-400 that I had packed securely in the bottom of the pack. I had also wrapped the lens in the original Nikon cloth lens case that came with the lens just to add a little more protection. The cloth lens case was probably the problem, had I not wrapped the lens, TSA would have been able to swab the lens without needing to completely remove it from the backpack and unwrap it. I am going to fly the same route in the next few weeks and will probably take a long lens again so I am anxious to see if I get the same result.