uncontrolled airport. overall, greg, as you look at the prospect of closing these control towers, does it worry you about safety? absolutely, alex, any time that you lose that tool of the air traffic controller being able to monitor the airplanes coming in and out of that airport or all aircraft, that level of safety diminishes only because you have a service that s provided to pilots to make them more aware of other airplanes and helicopters in the local vicinity. you take that tool away and now you put that onus solely on the pilot and then you see air traffic collisions and they happen in and around airport traffic patterns. i have been reading about small airplanes and helicopters, they have some blind spots, if you will. so is this what you re mostly concerned about here? i m concerned not only in flight, but on the ground