Originally Posted by grouse
AM/FM radio receivers are the nasty ones and no one allows them AFAIK.
US Airways does not expressly prohibit AM/FM radios, though some of its affiliated Express carriers do. I occasionally turn on my Walkman at 35,000 feet and FM reception is great when sitting by a window...being so high up, there's a station audible on nearly every frequency.
Receivers shouldn't harm any of the communications between ground and flight deck, even though the broadcast FM band is only a few megahertz below the ATC frequencies. To the best of my limited knowledge, it's only devices that transmit (such as walkie-talkies and cell phones) that can cause trouble.