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Location identifier - Wikipedia
IATA airport code - Wikipedia
IATA - Codes - Airline and Airport Codes Search
CLLI code - Wikipedia
Location Identifiers Search Tool - Federal Aviation Administration
Location Indicators - International Civil Aviation Organization (ICAO)
What is a location identifier (or location code)? | SAGE - IRIS …
Airport codes – Travel guide at Wikivoyage
CLLI (Common Language Location Identifier) - NENA Knowledge …