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To Cainehill, back on the Flying balance :
I don't think the Flying issue is comparable to SCs, Hoarding or many other in that Flying is a nation-specific huge advantage right from the start (for Caelum) or relatively early in the game(for blood nations).
Mech Militia et al. are not an option before mid-game, and not an option at all for many nations.
To illustrate this, in a pbem game, I (as TC) allied with Marignon and Ermor (BE) vs Caelum on turn 30-some. My allies+me were overall much stronger (in terms of income, research, gems, provinces) an yet Caelum manages to hold for 10 turns and bLasted most of Marignon and my armies.
And the game is on Hard research !

In another I'm playing Caelum (turn 25), just eradicated Arco main army (with Pretender), and on the next turn I turn against Machaka with all of my armies...
This is a just an unfair and unbalancing advantage, Caelum opponents just have no effective counter.