How are the departure and arrival airport codes in the OUT, OFF, ON and IN (OOOI) fields identified by ACARS and transmitted to ground systems?

For example, if my aircraft is diverted unexpectedly to Bangkok because of some emergency, will ACARS send the arrival airport code as BKK in the IN message? If so, how will it be identified?

  • $\begingroup$ I'm looking forward to an answer that includes definitions of OOOI. I mean, I get the Out, Off, On, In but what does it all mean??? $\endgroup$
    – FreeMan
    Dec 15, 2016 at 15:44
  • $\begingroup$ @FreeMan "OOOI (Out of the gate, Off the ground, On the ground, and Into the gate messages): Pushback from gate, wheels off, wheels on, arrival time at the gate, number of passengers, wheel chairs required, etc." $\endgroup$ Dec 15, 2016 at 17:24
  • $\begingroup$ @RedGrittyBrick - thank you sir! OOOI is certainly much shorter... $\endgroup$
    – FreeMan
    Dec 15, 2016 at 18:15

1 Answer 1


ACARS messages, unsurprisingly, use IATA airport codes.

See ARINC 618, 619, 620 etc.

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- ACARS, Dr. Maarten Uijt de Haag, Ohio University

  • $\begingroup$ Thank you for the detailed explanation. So the ACARS automatically detects the airport code and appends with IN to the Gate Acars message? $\endgroup$
    – Raj GT
    Dec 16, 2016 at 6:50

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