Just make sure it has wings, if not then surgically afd them via description. I know carbuncle has them in one incarnation. 
Edited.<---

On the summoner note: its more personal to the patron. In the case of Navire its upto imagination and some mutations of other patrons. Ill actually be playing a summoner because reasons. *cough*avatar*cough*. 

Edit. Summons last until dismissed. Some provide all of a character's functions so it would be a bitch to resummon every 10 rounds. That being said all summoners can have the same or different summon even more than one active. But no one can summon a patron without some serious magicite offering.