Okay There are currently 2 flying in the game.
The Flying Crossbow man & The Wingadon.
The Flying Crossbow Man's equivalent, is the Dead.
The Wingadon's equivalent is the Archidon.
The Wingadon has more health, does more damage, and is faster than the Archidon
The Flying Crossbow Man has more health(I think) does more damage(I think) and is faster than the Dead.
Okay, they cost more and take longer to build, so them being a bit stronger should be normal.
BUT, with that being said. 2/3rds out of all 18 different units in the game(That's 12) CAN NOT even attack* it. So, not only are they better than their equivalents they are also immune to a good amount of units.
You're going to sit there and tell me they aren't overpowered?
*By Attack, I mean a-move. Magikill, Medusa, Skeleton Mages, and Bombers, can use Spells/blow up to damage air units.