Also:
For V-weapon impact data, the Germans relied on their agent ARABEL (Juan Pujols Garcia), who was really a Double Cross agent for Britain (code name GARBO). He had actually got himself taken on by the Abwehr so that he could become a double agent, and was a key part of Operation FORTITUDE (the great D-Day deception).
Much to the surprise of the British, FORTITUDE did not "blow" GARBO; he was awarded the Iron Cross and then asked for the impact data.
Thanks to the misleading data provided by GARBO, the Germans gradually overshot their intended target area, saving thousands of lives.
While attempting to strike airfields would have been intrinsically futile, the impact data would have absolutely guaranteed complete failure.
In fact, one could argue that the Germans would have been better off if they had tried this strategy, as its complete failure would have been obvious very quickly, and they would have abandoned this immensely wasteful project.