Could Corsairs appearing in Florida in 1938 be studied and produced before Pearl Harbor, and how would they affect the war?
Short answerTheoretically yes; early production could give the United States a fighter capable of defeating the Zero and the Fleet Air Arm a strong Mediterranean fighter in 1940.
NotesA flight of Corsairs appearing in Florida in 1938 could theoretically give the United States time to study and produce the aircraft before Pearl Harbor. The counterfactual also places the Royal Navy among the earliest users, with Corsairs available in the Mediterranean in 1940. Fleet Air Arm pilots would gain an aircraft suited to their boom-and-zoom tactics against the German and Italian aircraft of that period. What Germany and Italy would develop in response remains an open question.