I never took my scanner flying but I did take it (Pro-43) to Pittsburgh Airport to listen to the planes while I was helping a friend of my mother's board a plane. Security spotted it and told me to turn it on after I told them it was a scanner and I'm an amateur radio operator. I tuned in the local tower and NOAA radio and they were satisifed. However, on a side note, my mother's friend, not always the brightest bulb in the pack, well, as I was putting on her huge suitcase to be weighed by the ticket taker, she blurte out, "here in my old *bomb!*" The ticket agents eyes got as big as a deer in headlights and I'm sure mine did too and I quickly responded to my mother;s friend, "that is a very poor choice of words there" and the ticket agent agreed with me. Luckily I was able to BS my way out of that one but that was the summer of 2000, a year before 9-11, if it was after, I would hate to see what would have happened. I really doubt the TSA would charge me or her with anything but to make their point, I'm sure they would detain us or a couple of hours and give her a good talking to. IIRC, even in the early 1970's, there was a story where Roberto Clemente of the Pittsburgh Pirates made a joke about a bomb while on a plane waiting for takeoff, he was removed and questions for a couple of hours and then had to take the next flight out.