A little one and a big one:
Little:
Christmas morning 1984, puddle jumper from Cheyenne to Denver. Me, the pilot, the co-pilot, the flight attendant. Looking back now, I'm amazed the flight wasn't cancelled.
Big:
US Air 6 am flight one lonely morning MCI-DCA around 2000 or so. Probably 5-10 people in the whole plane, half of them in first with me.