Analysis of information sources in references of the Wikipedia article "Kunming" in English language version.
{{cite book}}: CS1 maint: others (link)从1922年巫家坝机场建成到1929年，云南又建成了23个机场，机场数翻了24倍，在中国机场建设史上绝无仅有，机场建设速度之快，创造了一个世界第一！抗战爆发后，出动150万民工再建28个机场，机场总数达到52个，密度之大，堪称亚洲第一，世界少有，云南由此成为中国最主要的抗日空军作战基地。与此同时，云南人民向抗日前线捐献的飞机数量，名列全国第一！修一个机场最快只用20多天...
In June the 41st PS was organised in Kunming (Yunan Province), and with it served French advisors-volunteers. Their main assignment seemed to have been the securing the purchase of the Dewoitine D.510 from France. At this time the Japanese began continuous attacks on the city... French volunteers... fought the Japanese... repulsing one of the attacks by A5Ms... they lost four machines, from which two pilots baled out. After several days, the Japanese shot down three more and one pilot was killed. After this the group ceased to exist. Machin perceived the reason to be the significant superiority of the A5M over the Hawk.
In January 1939 the 18th PS relocated to Kunming for defence of the city from air attacks while continuing training on the Hawk 75Ms. Reportedly Claire Chennault led it (but the Squadron Commander was Major Yang Yibai)... 11 January 1939 Led by Squadron Commander Liu Yi-Jun (劉依鈞), the five remaining Hawk 75Ms of 25th PS were flown to Chongqing and transferred to the 18th PS. On returning aboard an air transport plane, all five pilots were killed when the transport plane crashed in an accident. In April, 18th PS took part in intercepting operations over Kunming as part of the Pursuit Group led by Group Commander Hu Zhengyu (胡莊如).
Tuesday, 18 June 1940, Japanese planes bombed Kunming, on the French Indo-China railway line... causing speculation of possible attack on Haiphong, which for two years an important entry point for imports to China.
When did World War II begin? Shanghai 1937: Where World War II Began answers that question in a way most audiences will find surprising. Americans might say December 7, 1941… The day the Japanese Imperial Navy attacked the American naval base at Pearl Harbor, Hawaii. For Europeans, it was September 1, 1939… When Nazi Germany invaded Poland. But in China, people will tell you a different date. August 13, 1937.
{{cite web}}: CS1 maint: multiple names: authors list (link){{cite book}}: CS1 maint: others (link){{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)