[Ulzgoroth]

Strictly speaking, AAA fire is direct: you've definitely got line of sight to your aimpoint.

In the case of small (ish) caliber automatic weapons used against low-altitude targets, it seems fairly straightforward that Gunner remains the skill to use even if you're pointing your weapon up in the air and leading the target. (It is for similar weapons mounted on fighters, after all.)

But the big stuff that can reach to high altitude is significantly fire-directed with time-to-altitude considerations being critical. Before radar proximity fuses were available you even had to set time fuses! This seems much more a matter of Artillery than Gunner. Any RAW addressing this, though?