I think it is absolutely fine to use an airship as Behemoth. Although the model is flying, I personally think that it just doesn’t look like it is flying very fast. I imagine it as a slow floating through the air, which is represented by M4. As a monster with height 4 it fits that the airship is able to look over other troops.
As long as you use the proper base size and explain to your opponent what this thing is, it is fine.
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