In 1942, the Second World War was at a stalemate. The Anti-Japanese War in China also entered an intense period. Japan cut off China's supply chains connection to the neighboring islands. The famous American-to-China Salvation Passage--Burma Road, is cut off with the Japanese occupation of Burma. To this end, the U.S. military opened a "Hump Route", and the pilots were nicknamed "Flying Tigers."
Assam, India was the starting point of the "Hump Route" which ended at Wujiaba Airport in Kunming, Yunnan Province, China, after flying over the Himalayas. This supportive air defense route was organized by the allied forces and led by the United States of America. This passage was considered a suicide route due to steep topography, bad weather, non-stop anti-air gunfire, Japanese planes interception in addition to the fully loaded aircrafts which limited climbing to a safe altitude. On these missions, the Flying Tigers lost a total of 1,500 aircrafts and nearly 3,000 pilots. As a result, the "Hump Route" was the longest, had the most difficult weather conditions and suffered the heaviest lost in the WWII Pacific.