Our flyers need a lot more to become viable than just be battleline. They need actually decent stats, or some extraordinary broken special rules. So I'd prefer the decent stats
The chiefs have no offensive stats, die to a stiff breeze. Their support is decent-ish relativly speaking, but only because rippers/terradons are kind of terrible base-line.
The units themselfs are again, super squishy, and offensivly they have 1 turn during which they can do
something, as both the rippers & terradons special abilities are one-time-uses. They're not even particularly powerfull during that one turn, it's just the only turn during which they will achieve anything whatsoever.
To fix them they need
some defenses, doesn't need to be major a +1 to save could be enough. Just something to ensure they don't just get annihilated turn one. The chiefs will need more of a buff defensivly than the units though. They need to be close to the frontline, and 5 wounds with a 5+/6+ save is simply not good enough for a hero that will be exposed to danger.
They will all need a
significant boost to their baseline offense.
The chiefs will need different CA's, because if the units are actually decent base-line then the current CA's are no longer all that good.
O, and we need something for coherency and possibly something for grabbing objectives depending on what role exactly you want them to fullfill.