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My search fu is weak so forgive me if someone has already asked this

So fliers MUST be in reserves right at the start of the game? So if I were to take a daemon flier (right now is the Blight Drone the only one?), would they not be allowed to be apart of Daemonic Assault? Or would Codex>BRB and they do count as a unit for DA and they DS as normal?

This may not be RAW, but the only logical thing to me, is that the Flier does not take part in daemonic Assault, and starts in reserves as normal.

Unless FAQ:ed otherwise, it should be apart of daemonic assault since codex > BRB.

Daemonic assault forces the army into reserve, but then allows half the army to deploy on turn 1

Nothing about the flyer rules, or 6th ed in general, changes this. Stick it in reserve, you can choose it as part of your preferred wave if you want, same as anything else.