If your monsters have flying animations you can have Mobs that fly around. : ) I have had bats that fly around and happily kill you and you can happily kill them and will soon be using dragons. : )
You have to position them correctly. If your say flying eye is to spawn initially in an idle position set them up that way or if they're supposed to spawn flying set them up to spawn at the right height.
Also, make sure to enable Ignore Y Distance for the different range checks - can result in an airborne enemy to circle around it's waypoints or targeted combatants, since it would naturally never reach the ground :)
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You can also try what I do which is to add a small box collider to each monster with Trigger checked and that seems to help avoid the circling problem.
You have to position them correctly. If your say flying eye is to spawn initially in an idle position set them up that way or if they're supposed to spawn flying set them up to spawn at the right height.
I've even used idle flying npc's.
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