Just an idea for the scheduling: On completion of a route creation (or on a view Route Information), a player will have a button to show candidate aircraft for the route.
This would be similar to the Schedule Summary on View Route of the currently assigned aircraft (an enhancement of this would be to show the route in question in a different color to highlight it).
So when a button is pressed to show candidates, the system will show a list of aircraft where this route can be assigned without conflicts. Perhaps, the route should be tentatively shown in a different color on schedule of all candidate aircraft. Some sort of easy "accept button" could be available for all the aircraft, and the player would click on "accept" button of desired aircraft.
This would make a route creation and assignment to schedule of aircraf a lot more streamlined. Route could be assigned on the same (enhanced) route view or creation page, without having to go to Scheduling Page.
So all of this could be done as enhancement of the enhancement to current Schedule Summary portion of the View Route Information page.