Route research now works on route awareness rather than airline awareness. You can enter a custom route awareness to see how it affects demand, or you can leave the box empty and the research function will grab your current route awareness for the route you enter (if exists) and use that to show you a much more accurate picture of demand. If you do not fly a route yet, it will default to your airline awareness (which currently is the starting point for route awareness on new routes)
The flight history
icon is still broken, I am trying to fix it.
The flight history
I am the developer of Airline Enterprise
