Large-caliber proximity fuzes against aircraft formations

Could large-caliber proximity-fuzed shells break up an aircraft formation at range?

In principle, yes, but only if enough guns and viable shells justified the development time and cost.

A question asks whether large-caliber proximity-fuzed shells could disrupt an aircraft formation at range. The concept was technically possible, but useful effect would depend on enough guns firing a viable shell. Development would therefore require time and money rather than one simple modification. A later follow-up adds that radar proximity sensors could be protected against firing shock more readily than hydrophones or other sound sensors.