I was under the impression from what little I'd read that the incidents of ground attack planes damaging tanks was normally damage to the engine compartments, causing damage to the fuel delivery system and the occasional fire, not necessarily destroying the tank, but rather causing damage that could not be so easily repaired in the field while under fire. I also got the impression that taking out the support vehicles was a much simpler and more effective way of dealing with tanks, since a tank without gas or ammo is just a lawn ornament.
Anyone who has read more or knows a bit more on the subject care to chime in? I don't know the specifics of armor and penetration capabilities of the various ammo, but it seemed to make a reasonable amount of sense.