On a day like this it's important to understand the difference between ADS-B and MLAT tracking.
ADS-B is the latest generation tracking where the aircraft transponder transmit it's own position (LON/LAT) based on GPS data.
Older generation tracking is based on the ModeS transponder that is just sending out a "ping" without a position. This ping can be triangulated with multilateration (MLAT) technology from 3 or more receivers. As 3+ receivers are needed, MLAT can often only be calculated for aircraft at higher altitudes (better coverage).
https://t.co/0obQ7ZlC46
NASA and @Int_Machines discuss highlights of the IM-1 mission, which marked the first U.S. soft landing on the Moon in more than 50 years. https://t.co/7QRrAVqHAz
As we continue to monitor the widespread smoke from wildfires in Canada, @NOAA's #GOESEast 🛰️ can see some of it being swept up by a large swirling low pressure system. Numerous #AirQuality Alerts are in effect across the central and eastern U.S.
More: https://t.co/wJGBXDcNu2