At this point, The Dragon powers and damage resistance is about right, but the dragon does appear to be overpowered for a few reasons. As of right now it seems like the only thing that can kill a dragon in the hands of a skilled player is another dragon.

1. Jetpack recharge:
The Jetpack recharges constantly and because of that the players can just spam the right click and this allows the dragon to evade EVERYTHING. Me and my opponent would fly right into a large group of anti air units (hunters with bird in the hand, grenadiers, ext.)
and just spam the right click on not even get a scratch. The Jet pack needs a 1 1/2 or 2 second delay after uses before it begins to recharge again. That way the dragon can't avoid everything for too long.

2. Respawn time:
The only thing people have to wait for is 20 recruits. One match I was gathering units in a forward position, then as soon as the dragons were ready for battle I heard "enemy dragon spotted." and I intercepted him and killed his dragon, then he immediately respawned and killed a couple of my units, I killed him again, then this repeats about 5 times and he finally kills me as I was inspecting my army, or lack there of now. The dragon needs a respawn timer of maybe 10-15 seconds or so.

3. Anti air missles are a little slow.
When I fly into a group of grenadiers and such the missile seems to move pretty slow. maybe increase the speed that the missiles travel so they aren't so easy to avoid. Maybe increase the speed by X1.5, even if it is an additional upgrade for imp binoculars for example. The missiles at this moment are just really easy to dodge, you don't need a very quick reaction time to avoid them.

So, if these issues get fixed, the dragon will be a bit more "fair" for the different player types. As of right now the players who want to use the zephyr dragon and focus on just the units and the usual RTS style gameplay, they won't stand a chance if their units can't even hit the dragon!

I'm still looking at other issues, at this moment this is all I have time to post. Let me know what you thinkk.