In the last few months, I've been on a couple of flights where I was the ONLY passenger on the 50-seater CRJ.

There were 2 pilots and 1 flight attendant to serve me. I felt like flying in my own private jet, even if it was only a 2.5-hour flight.

Unfortunately, the CRJ is still very uncomfortable even when I'm the only passenge onboard.
Flashback to 20 yearso ago. My girlfriend(now ex-wife) and I flew on a Northwest 747-200 from Honolulu to Tokyo. We were the only two passengers in the upper deck first class.(10 or 12 first class seats up there) No, we didn't goof around up there, but we could/should have!