Flying units in Heroes 2.

As for Phoenixes or Cherubim, when you have Armageddon in the spellbook and mana, it's a good strategy to break them into stacks and keep hitting them with Armageddon as long as you have mana. Rukh are generally amazing; they build quickly, are quite strong, and fly relatively fast. At the beginning, they're a real boon for a Mage. I like the red and green ones because you can resurrect them. But overall, Cherubim and Armageddon seem great to me; if not, then Phoenixes and Armageddon. But that's all, again, if... then... Breath of Death is also a pretty good spell.

Added after 49 seconds
And there are also ghosts that fly around in the Necropolis; they're quite something! :):):D