A Boeing 787-8 showed up at Boeing Field a while back.  It is listed as operated by Korean Air, but it is not in their markings, and it is identified as being used as a corporate transport.  I don’t know the details about it, but I doubt I will ever be needing to charter it, so it probably isn’t an issue.  I went over by the terminal to see it arrive in the morning.  I hadn’t anticipated where it would park but it did need to clear customs first and they parked it at one of the larger ramp areas near the customs pad.  This meant it taxied back to where I was which was handy.  Plenty of people were on hand to handle it when it taxied in.  I don’t know how long it stayed for.