For ICAO flight plans, valid entries for the departure, destination, and alternate fields include:
- Four-letter ICAO airport codes or
- Location identifiers listed in FAA Order JO 7350.9.
ForeFlight Verification
ForeFlight checks the format of these codes. If a valid 4-character identifier is unavailable, ForeFlight replaces the entry with "ZZZZ" per ICAO flight plan rules. The correct information is then added in Field 18 with keywords:
- DEP/ for departure
- DEST/ for destination
- ALTN/ for alternate
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