Thanks for the replies.
Indeed the man likely had a priority ticket, diplomacy has its own rights.
I have briefly went through the link but frankly I am most interested in the route Washington-Kunming. I know the man in question diverted from the route by flying to Cairo - the aircraft he travelled was unserviceable. I would like to know what were airfield on the route used by the 'airline'. Unfortunatelly, I do not have any related documents or log books. Also, I would like to know if any other units covered the route, eg. RAF TC or BOAC, etc.
Thanks