I ask this because I notice something earlier today that I found a bit odd.
I have an ADS-B receiver that feeds my local version of Virtual Radar. I often have both FlightAware open on one screen with VRS on the other. With this configuration, in VRS I can see ADS-B equipped aircraft within about a 65 mi radius of my location in real time. I see also see whatever FA is tracking with the requite delay. And what I saw/realized today is what prompted my question.
Generally, I will see local ADS-B traffic on VRS and then about 5 min (give or take) later the same traffic on FA. But today, I was watching a couple of UAL departures to the north out of EWR and in looking at both screens the positions of of these aircraft were pretty much identical. I don;t recall ever seeing that before. Generally, there is significant difference in positions. As a matter of fact, I live such a short distance from the north end of EWR’s runways any departing aircraft is usually long gone from view before even appearing on FA. Conversely, arriving aircraft are generally on the ground and being switched over to EWR “Ground” while FA is showing the same aircraft just about to turn on final to 22 R or L over TEB.
I don’t remember what the second flight was but the first one I noticed this on was UAL119. I had to leave after that so I did not have a chance to see if it was occurring with any other such flights.
So that is what prompted my question.