you are the only passanger on this flight sir
I've seen a few threads on this topic on FT ...
today I had the pleasure of being the only passanger on a Continental flight from MIA to TCB. The Beechcraft 1900 operated by Gulfstream was totally empty except for the 2 pilots and me.
The plane was picking up a full load at TCB going back to MIA so I guess they had to fly it.