I have observed some trends. Sometimes when I observing a flight trail on flight aware I notice a plane might have a sudden drop and increase in speed. The seep can drop from say 850km/hr to 260km/hr within minutes and it shoots back to its former range. Is this caused by abnormality in flight data feed or it’s happening in real life?
I’m new to aviation analysis so I’d like to have a basic appreciation of the flights.