From: Vermont, USA
I think there is a considerable difference between a more realistic Panzer General style game and something like War in the East or Command Ops. Absolute realism is reserved for much more hard core wargames. This offers the Panzer General style gameplay with more realism in many key areas, but there are still many aspects that remain close to the Panzer General / Panzer Corps style as it is a very fun beer and pretzels kind of wargaming.
Air movement was debated during the beta. The main reason I can see for restricting it has nothing to do with how far a plane could theoretically fly in a day, but rather how close to the front line operations were planned and how many air operations were done on targets of opportunity or with hardly any planning and how many were planned a day ahead, etc. In general, if you can find an argument against part of the design based on realism, there is likely another argument based on realism in favor of the design that you can find if you consider a bit more. Where concessions were made, there was generally a basis in reality to justify the concession, in addition to the usual gameplay arguments.
With all that said, I could certainly see expanding the air movement range, it would just need some additional testing to make sure it doesn't create any new gameplay or balance issues.