I think the obssession with not letting a single ROCAF aircraft takeoff stemmed from the days when ROCAF held qualitative advantage over PLAAF. Given the current balance of power in the air, as well as the accuracy of ballistic missiles, PLARF can afford to shift some of their focus to the destruction of other core capabilities rather than being pre-occupied with bombarding runways. if a few ROCAF fighters make it in the air it really isn't a big issue, since they will not have adequate support and guidance.
neither is it too difficult to suppress a majority of ROCAF's runways. take the two easter coast airports for example. lets assume that an initial barrage of 30 missiles hits each airport and disables them as repair teams attempt to repair, PLARF only has to harrass those engineers with 3-5 missiles at an hour intervals to render further damage and prevent any work from being done (since engineers will have to reassess after each barrage). this means 50 missiles will be able to suppress a single airport for 7-8 hours, that is a lot of time for a modern air force to do a lot of damage. and this is all discounting all other PLA assets.
Agreed.
But the issue is that runways are relatively easy to repair and we're looking at an overall campaign lasting at least a month.
Even if the entrances/exits to the mountain bases are caved in, they can be excavated and the planes start flying again.
I agree that the mountain airbases can be kept permanently non-operational, but it would require low levels of continuous strikes from aircraft, drones or land-based missiles.
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China potentially faces the same issue with attacks on its 40 hardened underground/mountain airbases by standoff missiles or bombs dropped by stealth aircraft.
But at a campaign level over the course of a month, China will have air superiority and/or active SAM systems over its numerous bases for 99% of the time. So runway repairs or excavating caved in exits/entrances is not an issue.