The A1 classification for minor leagues was formed in 1936 and abolished ten years later. It was the second-highest ranking, one step below AA (then the highest) and one step ahead of A. With the creation of AAA in 1946, AA leagues added another A while A1 leagues became AA leagues. Leagues to hold the classification were very limited in number, consisting of two circuits:
- Southern Association 1936-1945
- Texas League 1936-1942
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