Good morning, Spud,
I hadn't noticed! A good point though. I am without my main FSX computer at present, due to a suspected Power Supply Unit not supplying power. It's in the shop for diagnostics. There must be a way around this, but I have noticed that several FTX/orbx sceneries, when I "connect to new flight" in Flight Keeper, show the start point at, e.g., KSEA when I am starting at Vashon Mun or Wax Orchards, even though they appear in the FSX database. Even a "nav database" rebuild - several - has not sorted the issue. Is it something in the orbx coding of airfield BGL files? BTW, same happens at PAKX, i.e., but defaults to PAKT!?
I'll check when I get my main FSX box back, but I believe the only solution is to allocate "false ICAO" codes to the various cabins, docks, et al. But, I wouldn't know where to start!