The content of CreatedSource is the SecurityContext from the transaction that created the flight leg, or the user name if the flight leg was created manyally. See also: AodbTransData.
NB! As data comes from a new source, and is matched to one flight leg, the SecurityContext representing the source is just added to the DataSources list regardless of the new data actually updating the flight leg or not.
NB! In some cases DataSources can be longer than allowed by the type. In this case sources should be removed from the DataSources string until it is within the allowed length. Remove the sources starting with the oldest. The first source to be removed would then be the CreatedSource.
NB!ClassificationLevel = "PUBLIC" does not mean that all information, like passenger numbers, are public information, only that the flight leg itself is.