You would know by the fact that you had not been previously notified of the authorized use of airspace, and it's within a certain altitude range of the airfield

You would know by the fact that you had not been previously notified of the authorized use of airspace, and it's within a certain altitude range of the airfield and surrounding space. Certainly a lot better than just throwing up your hands and waiting for an A380 to go down because somebody had a bug in their flight controller.