This is the standard ADD FlightLegIdentifier. Only the relevant parts for helicopter lights will be used. None of the elements are required, but enough have to be present to actually uniquely identify a flight.
| callsign | |
| aircraftRegistration | |
| ssrCode | |
| flightId | |
| departureAirportIATA | |
| arrivalAirportIATA | |
| departureAirportICAO | |
| arrivalAirportICAO |