>>63928628yeah, I hadn't thought of that one
>>63928871By the time South Vietnam lost, US air power had been withdrawn for some time and their own air force no longer had uncontested control of the skies over the country. By 1975, the VNAF had suffered a lot of losses or otherwise had planes grounded due to enemy, and North Vietnam was able to contest their control with SAMs and their own aircraft (on top an advantage in tech, materiel, and manpower for their ground forces).
Not to say that they didn't win, but they won in large part through the nullification of air power as an advantage and only after that.