I was looking at the wiki currently and I saw that most of the planes that are out there are bigger airplanes, with not many planes that have less than 150 seats.
In the real world, there are 2-3 companies that take advantage of this by manufacturing small aircraft. (Bombardier, Embraer, McDonald Douglass(I think they merged with Boeing??))
In the FSA/OGF world there are none yet.
Maybe there are some that I missed??
Another thing is that the routes that are used with these aircraft are short-haul routes, used to connect a passenger from their home airport to the closest hub the airline has to that airport. Then these passengers get on medium-haul flights or long-haul flights to their final destination.
Overall, what I am trying to say is that the OGF world needs more short-haul routes and medium-haul routes than long-haul routes. We also need new aircraft to service these routes.
If there is something that I missed or anything you want to tell me, feel free to comment on this post.