When filing an ICAO flight plan, valid codes for the departure, destination, and alternate fields are four-letter ICAO airport codes or location identifiers from FAA Order JO 7350.9.
ForeFlight will verify the format of these airport codes in ICAO-format flight plans. If an airport does not have a valid 4-character identifier, ForeFlight will automatically replace the code with "ZZZZ" in accordance with ICAO flight plan format rules. It will then enter the correct information in field 18 using the keywords DEP/, DEST/, or ALTN/, followed by the airport identifier provided.
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