This is neat, but unfortunately ADS-B will not be required for all aircraft in 2020. It will only be required for aircraft within a 30 NM circle of certain majo

This is neat, but unfortunately ADS-B will not be required for all aircraft in 2020. It will only be required for aircraft within a 30 NM circle of certain major airports and inside (and above) class B or class C airspace. Realistically, most will probably install ADS-B out transponders. But there will be areas where pilots fly (Alaska, Pacific Southwest desert areas) where it won't be uncommon for airplanes to be missing ADS-B out.