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The load message contains, for each arrival airport, information about what actually is on board the aircraft that has the arrival airport as the final destination. For a single leg flight there will be only one LoadDestinationIATA airport, and only one LoadDestinationData as defined below.

LoadMessage

- - Identification
  - AircraftData
    - AircraftRegistration
    - AircraftConfigVersion
  - CrewData 0..1
    - CrewActiveOnBoard 0..1
    - CrewCockpitActiveOnBoard 0..1
    - CrewCabinActiveOnBoard 0..1

- - LoadDestinationData 1..*
    - LoadDestinationIATA mandatory
    - PaxSeatedOnBoard 0..1
    - CrewPassiveOnBoard 0..1
    - PaxAdultOnBoard 0..1
    - PaxChildOnBoard 0..1
    - PaxInfantOnBoard 0..1
    - CabinBaggageWeightOnBoard 0..1
    - LoadTotalOnBoard mandatory
    - BaggageWeightOnBoard 0..1
    - CargoWeightOnBoard 0..1
    - MailWeightOnBoard 0..1
    - EquipmentWeightOnBoard 0..1
    - PaxClass1OnBoard 0..1
    - PaxClass2OnBoard 0..1
    - PaxClass3OnBoard 0..1
    - PadClass1OnBoard 0..1
    - PadClass2OnBoard 0..1
    - PadClass3OnBoard 0..1
    - SupplementaryInformationText 0..1
    - LastMinuteChangeCompartment 0..1
    - LastMinuteChangeCompartmentLoad 0..1
    - LoadCompartmentData 0..*
      - LoadCompartmentId
      - LoadCompartmentWeight

- - end loaddestinationdata
  - SupplementaryInformationText 0..1

NB!!! On multi leg flights destination is really segment (all possible destinations the aircraft can visit on a multi leg flight).
This means some sort of structure is needed.

LDM		Load Message			ADD Term	Mapping comment
Element	Table	Field	Operation	Comments
2.1	ACT_FLIGHT	AIRLINE_DESIGNATOR	Identify	Airline designator	OperatingAirlineIATA	Part of the FlightId
2.2	ACT_FLIGHT	FLIGHT_NUMBER	Identify	Flight Number	FlightNumber	Part of the FlightId
2.2	ACT_FLIGHT	OPERATIONAL_SUFFIX	Identify	Optional Operational Suffix	OperationalSuffix	Part of the FlightId
2.3	ACT_FLIGHT	DATE_OF_OPERATION	Identify	Scheduled UTC date of departure	FlightDepartureDate
5.	ACT_FLIGHT_LEG	TOTAL_CREW	Update	Number of crew	CrewActiveOnBoard
6.	ACT_FLIGHT_LEG	ARRIVAL_STATION	Identify	Destination Airport	ArrivalAirportIATA
6.	ACT_FLIGHT_LEG_LOAD	DESTINATION	Identify	Destination Airport	ArrivalAirportIATA
8.	ACT_FLIGHT_LEG	TOTAL_PAX	Update	Number of passengers Adults/children for first Leg	PaxSeatedOnBoard
8.	ACT_FLIGHT_LEG_LOAD	PAX_ADULTS	Insert/Update	Number of Adults	PaxAdultOnBoard
8.	ACT_FLIGHT_LEG_LOAD	PAX_CHILDREN	Insert/Update	Number of Children	PaxChildOnBoard
8.	ACT_FLIGHT_LEG_LOAD	PAX_INFANTS	Insert/Update	Number of Infants	PaxInfantOnBoard
9.	ACT_FLIGHT_LEG_LOAD	CABIN_BAG_WEIGHT	Update	Cabin baggage weight		Total weight of all baggage in the cabin.
10.	ACT_FLIGHT_LEG	TOTAL_LOAD	Update	Total dead load for first Leg	LoadTotalLoaded
10.	ACT_FLIGHT_LEG_LOAD	TOTAL_LOAD	Insert/Update	Total dead load	LoadTotalLoaded
11.	ACT_FLIGHT_LEG_LOAD_COMP	COMPARTMENT	Insert/Update	Compartment	LoadCompartmentId	Can be multiple
11.	ACT_FLIGHT_LEG_LOAD_COMP	LOAD	Insert/Update	Compartment Load	LoadCompartmentWeight
12.	ACT_FLIGHT_LEG_LOAD	PAX_CLASS1	Insert/Update	Seats occupied by passengers class 1 including PADs		?
12.	ACT_FLIGHT_LEG_LOAD	PAX_CLASS2	Insert/Update	Seats occupied by passengers class 2 including PADs		?
12.	ACT_FLIGHT_LEG_LOAD	PAX_CLASS3	Insert/Update	Seats occupied by passengers class 3 including PADs		?
12.1	ACT_FLIGHT_LEG_LOAD	PAD_CLASS1	Insert/Update	Seats occupied by outgoing PADs class 1
12.1	ACT_FLIGHT_LEG_LOAD	PAD_CLASS2	Insert/Update	Seats occupied by outgoing PADs class 2
12.1	ACT_FLIGHT_LEG_LOAD	PAD_CLASS3	Insert/Update	Seats occupied by outgoing PADs class 3
13.	ACT_FLIGHT_LEG_LOAD	DHC_CLASS1	Insert/Update	Seats occupied by outgoing DHCs class 1	CrewPassiveOnBoard	Sum of all
13.	ACT_FLIGHT_LEG_LOAD	DHC_CLASS2	Insert/Update	Seats occupied by outgoing DHCs class 2	CrewPassiveOnBoard	Sum of all
13.	ACT_FLIGHT_LEG_LOAD	DHC_CLASS3	Insert/Update	Seats occupied by outgoing DHCs class 3	CrewPassiveOnBoard	Sum of all
11A	ACT_FLIGHT_LEG_LOAD_COMP	COMPARTMENT	Insert/Update	Cargo Compartment	LoadCompartmentId
11A	ACT_FLIGHT_LEG_LOAD_COMP	LOAD	Insert/Update	Cargo Compartment Load	LoadCompartmentWeight
11B	ACT_FLIGHT_LEG	TOTAL_LOAD	Update	Total dead load for first Leg	LoadTotalLoaded
11B	ACT_FLIGHT_LEG_LOAD	TOTAL_LOAD	Insert/Update	Total dead load	LoadTotalLoaded
14.1	ACT_FLIGHT_LEG_LOAD	BAGGAGE	Insert/Update	Actual Baggage net weight		BaggageWeightOnBoard
14.1	ACT_FLIGHT_LEG_LOAD	CARGO	Insert/Update	Actual Cargo net weight		CargoWeightOnBoard
14.1	ACT_FLIGHT_LEG_LOAD	MAIL	Insert/Update	Actual Mail net weight		MailWeightOnBoard
14.1	ACT_FLIGHT_LEG_LOAD	EQUIPMENT	Insert/Update	Actual Equipment net weight		EquipmentWeightOnBoard
15.2	ACT_FLIGHT_LEG_LOAD_COMP	COMPARTMENT	Identify	Last Minute Change Compartment	LoadCompartmentId	Separate list for LMC updates.
15.2	ACT_FLIGHT_LEG_LOAD_COMP	LOAD	Update	Last Minute Change Compartment Load	LoadCompartmentWeight