That might be the reason Harris designed it so the Flying Tigers stay in the mainland of China. If Hainan was labeled a Chinese territory then the whole rule on transports could become an issue as well as the Flying Tiger being able to attack units in seazones. The way the game is setup the plane is penned inside of China with the exception of Burma and Kwangtung.And if the Chinese could load onto transports it would be easy to use them with USA since their turns are back to back.
Good theory – that may very well be the explanation. I’d always wondered why Hainan was incorrectly represented on the game map (from the point of view of which territories were Chinese when Japan started conquering them in 1931). Formosa and Korea I could understand, since China ceded Formosa to Japan under the 1895 Treaty of Shimonoseki and recognized Korean independence (which proved to be short-lived, since the Russians and the Japanese both had territorial ambitions there) under the same treaty.