I listen with a few different Ham rigs. With two of them I have to be very careful to not touch the PTT as I don't want to interfere with anyone's day
On a good day at home, I can listen to 5 different airports, and I can hear ground ops and ATIS from 2 of them. For those with a shortwave set, you might find international over-ocean air traffic interesting too (if you can stand the static) and don't forget Military ops. Keep 121.5 MHz plugged in too- you never know what you'll find there but it WILL be interesting when you hear it.