What does flight ID mean here in the picture? It is stated in brackets for Performance. I searched but couldn't find an answer. I would be glad if you help.

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2 Answers 2


Since you tagged , I assume this is about the G1000 avionics as installed in the DA40. The manual for that G1000 unit is available on the Garmin website. According to the manual, the Flight ID is the aircraft identification transmitted by the Mode S transponder:


The GTX 33 Mode S Transponder provides Mode A, Mode C, and Mode S interrogation and reply capabilities. Selective addressing or Mode Select (Mode S) capability includes the following features: [...]

  • Flight ID (Flight Identification) reporting – The Mode S Transponder reports aircraft identification as either the aircraft registration or a unique Flight ID.

As to why it is under the Performance step: the flight ID is entered on the Timer/References Window, which is the same window where the speed bugs are entered. So it makes sense to have it on this step:

Timer/References Window

  • $\begingroup$ That was a very comprehensive and descriptive answer, thank you very much. $\endgroup$
    – pilot162
    Oct 4, 2022 at 14:39

The callsign being used for this flight, which will then feed from the FMS into the Mode-S transponder. This is how FlightRadar24 tags your flight.

  • $\begingroup$ I suspect this is indeed the correct answer. Question remains: why is it listed under performance? It could fit under flight plan (where the Flight ID is defined) or Radios (because the Flight ID is going the transponder, which is a fancy radio transceiver). With performance, the Flight ID has no relation. $\endgroup$
    – DeltaLima
    Oct 4, 2022 at 11:46

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