Originally Posted by
Often1
Another possibility is that ir is a market to alert staff that there is sensitive information in existence which is not generally available. This might include information about medical conditions and the like which have been provided to BA for the express purpose of demonstrating "fit to fly" but which should not be reviewed by staff in the ordinary course. Having the flag alerts staff to the possibility that a given file may require a different channel review.
Once documents are viewed they are deleted and no record of the fact that someone has sent documents before is kept. There is just a note in the affected pnr that docs were received.