I’ve been really trying to imagine what the AA dice might look like (IL really earned his keep with that idea.) Text is a definite not. Picture of an AA gun? Naah. Seems a little too “Milton Bradley” kiddie to fit in with the other dice you’re making. Which are obviously first rate and geared towards the advanced A&A enthusiast.
So I started thinking AA gunsight. Did some looking around. Most AA gunsights are very grid-like and somewhat plain (probably not something you’d put on a die.) But I found this one I thought had just the right classic lines for the intended purpose:

This is a 40mm Bofors AA gunsight. I drew this in Illustrator. I was picturing it on a white or light grey (AA piece color) die with all the other sides blank. You spot that badass in a roll and POW-POW-POW! Plane’s goin’ down!
Now I assume you screen print your dice so these lines might be too fine at dice size. If you used the original vector Illustrator file and screen printed it with a 300+ screen and using film (not liquid) emulsion… hmmm. Anyway, I drew the proportions matching an actual gunsight from a museum photo but the lines could always be beefed up for printing purposes if necessary.
You say help us design 'em… we help design 'em!  :-D ~ZP