Friendly fire

The use of airplanes in WW2 went up. They were used for reconnaissance, bombardment, supply, dogfights and... based on this picture, friendly fire. Aviation played a key role in the war. First it was the Luftwaffe which utilized it for their Blitzkrieg tactics. After that, airplanes had a crucial role in the Battle of Britain where the UK and German air force collided.

BLUE ON BLUE. 

Soon enough the Soviets, Americans, Japanese... everybody was racing to make the better fighter or bomber. There were crazy aircraft models being produced: jet fighters, plans for world-wide-bombers which could drop nukes on the other side of the globe, submarines with airplanes... In the end, the Allies prevailed in the skies since the Axis supplies were running thin and they couldn't keep up with the production and aviation financing.