I have noticed that the tracking data for many (most?) flights contains anomalous altitude and climb/descent data. For instance, a flight might have been descending from a cruise level of FL430 for a long time, then suddenly is shown as climbing again or even as level at a MUCH higher altitude. Can you explain why this happens so frequently? The feature would seem to be quite unreliable.
I am a new user, but am enjoying the site greatly. Too bad I can’t access it while I’m flying!