* You can use transport aircraft to dump supplies as close as they can get along a supply route and they'll still be useful. They don't have to be dropped on the troops or an airfield or port for them to get in to the supply system. Anywhere on the route will do. Base them somewhere they have access to a decent amount of supply (supply depot if possible) and select the hex where you want supplies delivered. Watch them, though, as the AI will intercept them if it can.