There once was an airline which operated under those principles. PeopleExpress, Bus of the American Skies, used to line people up and simply ship them off on t

There once was an airline which operated under those principles. PeopleExpress, Bus of the American Skies, used to line people up and simply ship them off on the next available flight. People could (and would) jump ahead in the line by paying someone ahead of them to switch places. You had to pay additional fees for everything except your seat. Like all a rabid experiments in brutal capitalism, PeopleExpress went bankrupt.