Originally Posted by
tumtiddle
ACARS does not equal transponder so what you see on FR24 is not ACARS data.
Just to clarify, on a plane the
ACARS only transmits on events. i.e. not constantly last report was at 1:07am
ADS-B transponder transmits twice a second (used by flightradar 24)
How it works - Flightradar24.com - Live flight tracker! - last report 1:21am
The Radar transponder responds to a air traffic control radar painting the aircraft, the transponder then transmits information such the planes registration number, speed & altitude.
Secondary surveillance radar - Wikipedia, the free encyclopedia - last report 1:21am
After 1:21am the plane ceased to transmit anything at all.