To conquer the command of the air means victory; to be beaten in the air means defeat and acceptance of whatever terms the enemy may be pleased to impose.

Command of the air meant victory. He proposed an independent air force composed primarily of long-range load-carrying bombers. Aerial strategy
In his book Douhet argued that air power was revolutionary because it operated in the third dimension.

He was a contemporary of the 1920s air warfare advocates Walther Wever Billy Mitchell and Sir Hugh Trenchard. He was a key proponent of strategic bombing in aerial warfare.