I would have posted this under a miles and points section but there is no listing for Eastern Airlines.

When in college, 40 years ago , we would take the Eastern Airlines shuttle between LGA and Boston. They would have a constant turn around of defunct planes- DC 6’s or Electras, and you would line up and when a plane was filled, they took off. Could come any time and usually didn't have to wait more than an hour.. No baggage service or check in. During the flight the stewardesses would come around and collect your $25 .

Great idea, why don’t they do it now, maybe for fuel/inflation adjusted $50.