Please be aware that you can listen into the communications in the US but not in a variety of other countries. It is technically illegal in the UK but nobody bothers as we have lots of plane "spotters" who are more likely to spot a terrorist with a missile than the police. It is very illegal in Germany and they can have a complete sense of humour failure there.

The answer depends on the country. If you are outside the US then I might be able to look it up for you from the list in the office.

Spotwelder
When the spots on the radar screen weld themselves together...