Nexerus plays them.
On the topic of Airships and Anti-air fire, my take on it is pretty much that by and large they are armored like the naval warships they emulate (though not to the same degree of course. an Elan Battleship, even a very large one, likely isn't quite above that of an armored cruiser on the sea in terms of armor) and so that means that Flak artillery is generally out of the question. What that would mean is that AA guns need to be accurate enough to actually hit them dead-on and powerful enough to punch through the ship's armor. Then also there comes the issue of a proper high angle carriage for the guns that is easy to deploy in the field. A moving target is hard enough to hit with artillery of the time, a moving target in the air raises its own host of concerns.
Tl;DR: Airships can be countered by dedicated AA batteries, but that doesn't mean said batteries are an automatic death sentence.