Si non potes reperire Berolini in tabula, ludens essetis non WIF.
Hey, get your stinking cursor off my face! I got nukes, you know.
Buuut you can house rule it. What about some negative mods. to the incoming land combat if less than 5 is scored by AA?
Sure you can house-rule it; I have several house rules myself that we usually use. But honestly the best defense against paradrops is a good array of fighters!