I honestly think its balanced for Zeps to have AA guns, as to use them would require them to be under the enemy thus closer to land and range of enemy AA.
Instead of IFV Guns I think Tank MG would be more balanced.

Speciality bomb is a good idea too, the current bombs are a joke. Zeppelins are just flying ducks (lol) to other factors and the fact they lack a weapon is lame

if they are to be split, i would say that heavy zeppelins should have a fairly reduced speed, and only 1-2 cannons rather than 2-3 plus AA. Would also say that the smaller variant should instead not allow planes to fly and be reduced to purely a civilian/cargo vessel rather than allowing it to be a fighting vehicle, not changing the range on the heavy variant so as to still encourage the use of regular aircraft carriers instead of heavy zeppelins over the ocean. Also don't think that regular zeppelins need any more cargo allowed, and that instead the heavy zeppelins should get either reduced or no cargo capacity, and are only allowed droppers to use as fighter ammo storage. Fuel consumption rate should be relatively high on heavy zeppelins, though potentially, rather than requiring tnt (which personally sounds like a bad idea), has a much more volatile sink% on redstone, with a higher requirement for it, though with less wool required. Some specially-made cannon would probably be best for balancing, having it be somewhere inbetween IFV and tank MG. Personally, would say that rather than giving it AA, the other given weapon should have light anti-air capabilities so as to be able to deal with a few harassing planes or other light ground vehicles, but not having flak machineguns

Why not just #FreeThePlanes and have zeppelins give buffs to them when in range, the carrier craft system is really bloody annoying and should be removed, heavy zeppelins should be like the dreadnought of the sky, fairly slow but quite large and well armed so that you can actually bring them into combat instead of trying to hide them 100 blocks away, cargo zeps would be slightly smaller and a lot faster and have much higher chest capacity but have no armament and provide no buffs to planes

tbh i think that the cargo version should be allowed to have more blocks (I say 15000) and allow many types of movecraft to be transported on it, eg: tanks, i would personally like more if there was even 1 more type of zeppelin just for player transport as my version of cargo zeppelin would be too buffed already

I disagree with reducing speed, the only thing that makes zeps convenient is the fact they can fly over landmass,but compared to any ship its fairly slow. Making slower would be like walking through honey

Cargo Zeppelin should be just a cargo zep with no bombs only aa guns cause cargo
also, the Heavy Zeppelin only has aa guns and tank mg.

unless the speed has been changed and i am unaware of it, zeppelins currently are 12m/s, which relatively speaking is quite speedy and is on par with the speeds of cruisers, destroyers and carriers, on top of the bonus of fair fuel efficiency and flight