Flying type is my second favourite type (after electric). My favourites are Bravairy, Talonflame, and Noibat!
I don't know if you have any dragon types on your team, but my competitive Noivern is one of my favourites. She has amazing speed and sp. attack. She frisks the opponent, then she can use 2 draco meteors and then I u-turn her out for later! She nearly always hits first. Good luck deciding
Fletchinder. I just think they look really pretty. I used one on X and couldn't bring myself to evolve it. It's also the only pokemon I managed to reach full Amie affection with. :3
And Zapdos; Zapdos just hits a special note with me for being simillar to my old pet cockatiel (who was older than me and lived to be 20!) and Zapdos was the only pokemon that wasn't Pikachu that I used on my first play of Pokemon Yellow as a kid.
I really like Noivern, 1st because I love bats and also because I like dragon types.
Talonflame is also cool. I actually caught a fletchling before I knew it's final form, and gave it a really dumb name. So now I have a super powerful Talonflame named Pootzle.
My favorite Flying type is Staraptor, because he was half of my platinum team (guess who the other half was), which was my first game. Not that useful in the metagame, aside from the Final Gambit set, but he'll always be my fav!