In the mid-80's I was on a NW itinerary from BOS to SEA, connecting in MSP. Because of schedule constraints I took a 6 am flight from BOS to MSP. It was a 747, and it was pretty obvious that the only purpose of the flight was to re-position the aircraft (I assume for an int'l flight). As I recall, there were only two other passengers! The service was fine, but they didn't invite us into FC