FlightAware Discussions

US ASD-B Mandate

With the US mandate for ADS-B now in affect, how come there are commercial and corporate aircraft operating in the Flight Levels and locally in Class B airspace without ASD-B? I am still seeing numerous Mode S aircraft.

At the moment my site reports 260 aircraft, of which just 4 are “other Mode S” with valid ID. Those may be operating under a temporary FAA 12555 exemption.

1 Like