A QSI (Quality of Service) model, along with some other industry standard network planning formulas will fix these issues. This will make it so spam can liners will have a low passenger preference compared to a L-1011 in a nice config with 5 star service. (for example). There is a way to balance it out so new airlines don't get hit as hard too.
All the other sims don't have this model in place, you can tell because spam can liners ALWAYS win vs another airline.
If you go down the the path of AirwaySim, and start nerfing the Boeing 757 and other planes because the model is wrong, well that will just make the game too hard. On the contrary, Airline Empires has too loose of a model, where you can basically create demand in the millions/billions from nothing.
From what I see now, it looks like the implementation of certain formulas will fix it, along with a payload/runway calculator (so I can't fly L-1011s on MDW-LAX anymore), catchment area calculator, hubs/connections and realistic traffic rules. I am sure I will come up with more once I dig into my files further.
