Hi everyone....I recently bought a PRO-82 scanner from Radio Shack (it works great!). Anyway, I live near a small airport and have recently heard the controller say to a landing aircraft "cleared for the option Rwy. 30". I was wondering what does the "option" mean exactly? My second question is, since the airport I live next to is a small facility the tower closes down at 8:00pm. Past 8:00 there are three more SkyWest flights that come in. Who controlls the airport during the time the tower is closed? Thanks for your help!