Which aviator was known as the "Ace of Aces" before World War II?

Edward V. Rickenbacker is recognized as the "Ace of Aces" before World War II due to his remarkable achievements as a fighter pilot during World War I. He was credited with 26 confirmed aerial victories, making him the highest-scoring American ace of that conflict. This title reflects not only his superior skills in aerial combat but also his strategic contributions to dogfighting tactics at that time. Rickenbacker's legacy as a leading figure in aviation and military history solidified his status, leading to his recognition well before the outbreak of World War II.

In contrast, the other individuals listed do not have similar associations with aerial combat or the specific title of "Ace of Aces." Lindbergh is famous for his transatlantic flight, Custer was a military officer known for his role in the Indian Wars, and Doolittle is known for his famous raid on Tokyo during World War II but did not achieve the same level of notoriety in World War I as Rickenbacker.