SubmitLoadData( transData : TransData, iataLdmData :
...
IataLoadData) : ResponseStatus
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 in IataLdmDataIataLoadData