What's the plural form of antiaircraft? Here's the word you're looking for.
Answer
The noun antiaircraft can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be antiaircraft.
However, in more specific contexts, the plural form can also be antiaircrafts e.g. in reference to various types of antiaircrafts
or a collection of antiaircrafts.