I do wonder though how considerable, and sustainable, the Chinese air assets were. Even with large numbers of airframes available, the training of Chinese pilots was far inferior to US, and air operational experience was weak.
That somewhat depends on precisely when the US decides to take the offensive. As a general rule, the later in the war it is, the better trained and more experienced the Chinese air force would be for... obvious reasons. While they never managed to match the USAF's capabilities, it nonetheless still means that the later in the war the US makes the decision, the more difficult it will be if the Chinese respond by releasing additional air units.
This extends to the ground forces as well. In the early-war period, the Chinese suffered from logistical disorganization which hampered their forces fighting effectiveness. The later in the war it is, the more entrenched and better supplied the Communists are.