Battle of Britain
The Luftwaffe tried to win control of the air ahead of an invasion but could not defeat the RAF, which fought back with radar and fighters; Hitler postponed the landing.

German Air Force photographer · Public domain · Source
With France beaten, Germany prepared to invade Britain (Operation Sea Lion) and from July 1940 sent its air force against RAF airfields and aircraft factories. Britain resisted with its radar chain and Spitfire and Hurricane fighters.
When Germany switched in September to night raids on London and other cities (the Blitz), the RAF recovered, and Germany never won air superiority. Churchill honoured the pilots: “Never in the field of human conflict was so much owed by so many to so few.” It was the first major battle fought entirely in the air.