General structure to allow different flight identifiers. Many identifiers can coexist.
GUFI
Globally Unique Flight Identifier.
IATAFlightIdentification
Flight identification structure as defined by IATA, also known as UFI (Unique Flight Identifier).
ICAOFlightIdentification
Flight identification structure based on usual ICAO fields present in the Flight Plan.
IFPLIdentification
Flight identification based on a unique identifier assigned to a flight plan.