I looked up the history of ET-AVJ on Flightradar24 and noticed that 2 days before the crash, there was an anomaly in it's flight routine. Can anyone shed some light on what that might have been? Looks like ET2860 and 2861 were the flight numbers. I looked up some other tail numbers of ET planes on that similar routing and didn't see any logging of movement with non-existent flight numbers. Could it have been a maintenance issue being tested during that time?