The Allied forces at Dieppe were not massacred by the LW AND the Allies needed air superiority the days of the landing,not weeks before .If you wish to learn about air superiority and it's ability to sway a landing, then read about the Dieppe Landings.
The Allies did NOT have air superiority and the Luftwaffe (who DID have air superiority) massacred the Allied troops as they were trying to gain a beach head.