masloki
Pattern Altitude
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- Aug 23, 2011
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Nunya
It’s your logbook.Which one to write in the logbook or doesn’t matter?
That said, the 4 letter code should be unique worldwide whereas the 3 letter code can repeat. IATA is a 3 letter code and unique but not all airports get IATA or ICAO codes which is where the repeats can sneak in when the local regulator uses 3 letters.
It’s so vanishingly rare that the odds of it happening in your logbook are basically nil, such that if you have been logging 3 letters, I’d keep doing it the same and throw the ICAO in the comments.