List of Airport Codes (Dixie Forever)

Starting in the 1930s, the CSA, USA, United Kingdom, and several members of the British Empire realized that with the proliferation of air travel, they would need some method to uniquely identify their airports from one another. The US were using 2-letter codes, while the CS were also using many of the same codes, leading to confusion. The nations agreed to use 3-letter codes (17,576 permutations) for all airports within their control, later expanded to a four-letter code in 1972 (456,976 permutations).