I don't think its about having wings. Flying magic is a easy thing if you try to reread the part in WW III where the Russian magicians are angry at the super bomber of the academy city roaming free on their sky. They are angry because, in the past. Magicians reign supreme in flight battle but since its easy target for spells when your high above. Its become prohibited or rather unwise to fly. Just like how Kaori struck down Mjolnir down with a spell that hits down flying magic.
And I think Number 10 of the saints are probably a saint that doesn't have an alliance or a group where he/she belongs thus she is free to do what he/she wants. Kaori is constricted by the laws of the Angelican church. Though this is just pure speculation on this part.
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