Depots? I would love to see them come back as part of a tactical air & ground game play model. Also the concept of a "moving front" based upon airfield capture is flawed IMO.
OK I know we now capture towns which are hard wired to airfields. But the game play is still the capturing of fields thru the aquisition of linked towns.
I would like to see terrains built on net works of roads joining towns. Logistics and armoured vehicles move along (vehicles spawn along) these roads. At key points on the roads are towns, bridges, vehicle fields, depots, barracks, ports, even cities. the war is fought by gaining territory by capturing these assets. Some of them are strategic (they contribute to the nations logistic strength) some of them are tactical (they are ownership points on the local logistic routes).
Air fields would also be on or more usually immediately adjacent to these road networks.
All assets are capturable. But by capturing key points on the road networks logistics (except for player supplied air borne logistics) to all non strategic assets can become cut off from a countries strategic assets and so decline (through lack of repair) to White flag status or a point where the facility is not capable of defending it's self from it's own resources.
Airborne troops will still be able to capture stuff behind the front line to open up "new fronts" or counter a single line of advance.
Airborne supplies will still be able to re enforce fields cut off by enemy pincer movements along logistic routes.
Air Combat now moves ( in the main) away from airfields to these areas where assets towns, depots, cities, vehicle fields, barracks, bridges Are under attack.
When a country has conquered the requisite % of it's opponents territory the map is reset as now.