OK, time for first update.
RoC Air Force: 1945- 1948
With the end of Second World War and beginning of Chinese Civil War, the United States decided to give extensive support to the small Republic of China Air Force.
United States now had gigantic numbers of aircrafts that were used in war and now were not longer needed. China, on the other hand, had very small number of modern aircrafts. So, United States decided to give many of them to China.
But, one thing had priority- training new pilots. No use of new planes when you don't have good pilots to fly them. So, United States and China decided to solve that problem by founding six Flying Schools: in Hefei, Suzhou, Ningbo, Wengzhou, Guangdong and Changsha.
As instructors, they decided to try to keep former Flying Tigers, by offering them good salary. US Army Air Forces also sent a big number of their demilitarised ( and active ) pilots and aircraft technicians to help establishing these schools.
Also, planes were needed. So USAAF decided to send them big number of Piper Cubs and T-6 Texans to be used for initial flying training. More than 100 of each were initially sent. In later years, RoCAf obtained 200 more of each.
Piper Cub
They will be used for initial flying training for new pilots. Chinese, on the other hand, made a selection of future cadets and built a infrastructure.
For existing pilots, that mostly flew on aircrafts that were not modern even in 1939, new aircrafts were necesarry. So, USAAF sent them large numbers of Curtiss P-40 Warhawk ( about 100 of them initially ), Republic P-47 Thunderbolts ( 100 of them ), North American P-51B Mustang ( about 200 of them initially ), Douglas A-20 Havoc ( about 100 of them ), North American B-25 Mitchell ( 100 of them ), Consolidated B-24 Liberator ( 48 of them ) and for transport, about 100 Douglas C-47 Skytrain.
P-40 Warhawk
P-51 Mustang
P-47 Thunderbolt
A-20 Havoc
B-25 Mitchell
B-24 Liberator
C-47 Skytrain
During 1947 and 1948, as training progressed and larger number of trained pilots became available, USAAF sold to China, ( for nominal prices, about 1000 USD for single aircraft ) additional numbers of these aircrafts. That brought numbers of these aircrafts in RoCAF service on about 400 each, with about 300 B-25s and 100 B-24. All of them were not yet used because of lack of trained pilots, but were bought anyway, to be used later when pilots became available or as attrition or combat loss replacements.
Meanwhile, construction of airfields was under way, especially near of what it will later become the Inter-Chinese border, near Manchuria.
Chinese Civil War finished in late 1948, with signing the Treaty of Ulan Bator. After Soviet Union threatned to activly intervene on side of CCP ( that had power in Manchuria and Beijing ). USA were supporting the RoC. They even sent a squadron ot their nuclear bombers B-29 on Okinawa to remind Soviets that they still have a nuclear monopolly. China needed peace to consolidate.
By the Treaty, both sides basicly kept what they had at the moment, agreed to exchange prisoners of war and to respect demilitarized zone between them observed by foreign observers from Poland, Czechoslovakia, Ireland and Switzerland.
Chinese Demilitarised Zone near Beijing