Transponders, Surveillance Evolution, and Understanding Flight Tracking Discrepancies

A detailed close-up of an aircraft transponder set to 'ALT' mode in a cockpit, with a laptop screen in the background displaying Flightradar24 tracking data, illustrating Mode S Elementary Surveillance (ELS) configuration and MLAT tracking geometry.

By Trans Global Training Ever reviewed a flight playback on Flightradar24 and seen an aircraft take off into thin air, track parallel to the runway through farm fields, jump in sharp 90-degree steps, or abruptly vanish on short final into a coastal airfield? When flight crews or operations report these anomalies, the immediate question directed […]

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