I was one of two once on a flight from STL to LA where TWA
had back to back flights within hour and mine was going to be delayed for minor mechanical issues. Given it was a flight late evening I din't care as would get in late anyway.
I was in FC and the guy I was flying with from my office other passenger coach. They had him move up to first. There were about 20 dead heading flight attendants, no menus, and they asked us which movie we wanted. The only downside was the flight attendant we got was the only gay guy on the flight
https://www.nydailynews.com/news/national/ny-man-passenger-flying-alone-empty-plane-20190813-idafy5efqbcf3nbr2cv4iy7nvm-story.html