When flying, I always carry a scanner, a Kenwood TH-6 (3-band handheld ham transceiver), a GPS unit and cell phone in my briefcase. I sometimes get questioned at the security checkpoint, but I show them my ham license and my GROL commercial license and that usually ends the discussion.
Naturally, I do not use these items on the plane as they are now generally forbidden on all flights. As I said in an earlier reply here, about 10-15 years ago, I think it was Delta or USAir that stated in their in-flight magazine that "VHF scanners" were permitted to be used. I really could never figure that out because they did ban all other radio/TV devices. Most of the aircraft communications are VHF, so why would they allow VHF scanners? Anyway, I DID use my scanner at that time (when it was OK) and never was questioned.
Also, United Airlines used to have one of their audio channels tuned to the cockpit/ground communications. I have not flown on United in recent years, except on their short-haul commuter service which has no audio available, so I don't know if they still offer that on one of the audio channels.
In recent years, I have not flown as much as I once did, but now have a new job which will require more travel, so I will monitor this issue.
