Folks, love FA, have a PiAware feeding data and occasionally run Virtual Radar Server for enhanced map, use it regularly for flight notifications but here come the BUT…
The Mobile App seems very erratic. My default screen is Near Me but couple of days back an A380 went directly overhead, probably around 7000 feet on approach to Heathrow, which is close by. At same time an A319 crossed the path of A380 and curious of altitude difference I loaded up my mobile app - No sign of the A380 on the map anywhere, the higher A319 showed. Refreshed the display a number of times as I know data can be delayed but still no sign of the A380.
I have noticed aircraft not appear to show up before but put that down to delay in ADS-B signal data reaching device, not normally noticed as mostly use SkyView or VirtualRadarServer but if away from home address must admit FlightRadar24 appears more reliable.