The “tracks” on those websites are created by civilian receivers that transmit info of planes they detect. There’s a huge margin of error, and a plane’s reported “position” can jump by dozens, if not a hundred, miles as it moves from one coverage area to another, particularly when it crosses a coastline. Not to mention, that’s a privately-run website, not some “official source”. All that video demonstrates is the imprecision of the websites track-generator algorithm.
I am assuming that was a regularly scheduled flight so lets look at the radar tracks from the previous days (weeks) and compare that to what we see here.
... that’s a privately-run website, not some “official source”.
I am amused by your faith in official source(s).
I have said it 100 times.
The website is only as good as the algorithm the software guy wrote.
If the icon appears to be moving sideways, it doesn't mean the real airplane is moving sideways.
On the other hand, if the icon disappears suddenly altogether, what is really happening is dependent on the software driving the display. For example, when the aircraft is at around 400' height above the ground, the image disappears, but the actual aircraft just dropped "below the radar" on landing approach.
The image of a real air traffic display would be much more useful, but I doubt we will ever see that posted on the internet until long after the accident investigation is completed.
Flight radar is a combination of FAA data and civilian receivers. The FAA data is a world wide compilation consisting of commercial and most corporate aircraft. Civil aircraft are generally phasing into this database by requirements to upgrade or install for the first time more sophisticated transponders. The FAA data is updated about every 3 minutes as I recall.
Where the civilian transponder receivers fit in is primarily with civil aviation as these aircraft are not likely to have satellite communications. These receivers can fill the gaps so to speak for civil aircraft generally and to give more rapid updates in high traffic areas such as airport approaches. The receiver range can be 50 miles or so as I recall but varies quit a bit depending on hardware, antenna and geography.
In between receiving data updates, flight radar displays an estimated position based on speed and heading from the most recent data update. The data box in the sidebar off the map has the speed, heading, altitude, etc. if the most recent hard fix. You can see it change every few minutes.
That youtube video was intriguing. It showed the positional and flight deviations were radically different between the “live “ data and the archived data that I think he said was about 24 hours later. Why the changes?