text: Routes are outlined before departure time to select the shortest and most efficient route?
classes:  No, routes were not planned but relied on the experience of the pilot to be able to fly as efficiently as possible.  Besides, routes were not planned but relied on the experience of the pilot to be able to fly as efficiently as possible.  Yes, routes were not planned but relied on the experience of the pilot to be able to fly as efficiently as possible.  Meanwhile, routes were not planned but relied on the experience of the pilot to be able to fly as efficiently as possible.