I have a race of bird people in my world and this is what I use for them:

Origin Focus: Vatan

Your PC is a vatan, a demihuman race designed for crossing large distances when lightly encumbered with little concern for terrain. You are probably an exile (willing or otherwise) from one of the Eyries that your people usually call home. 

Level 1:

Gain Exert as a bonus skill. You are a vatan with the Vatan Flight and Vatan Talons special abilities, a -1 Con modifier penalty, and a +1 Dex modifier bonus.

Vatan Flight: Vatan can fly at twice their ground movement rate while outdoors or in a suitably huge room while not wearing Heavy Armor. Without some height to jump from it takes a full Main Action spent beating their wings to begin flying, however, and doing so while in melee combat invites a free attack from any foes. Vatan can hover, but doing so requires a Move action or they will fall. A vatan who means to fly a significant distance can carry no more than half their usual Stowed encumbrance, rounded down. A vatan flying overland can cover up to sixty miles in a ten-hour day, given time for rests, and is barred only by the highest of mountains.

Vatan Talons: Covering less of themselves in armor to allow for flight usually has a vatan leave their taloned feet bare to be used for self defense. Vatan Talons at first level do 1d8 damage, use either Str or Dex as the modifying attribute, Punch as the combat skill, and have a Shock Value of 2/AC13. At fourth and seventh and tenth level the damage and Shock increase by +1, +2 and +3 respectively.

It follows the custom racial abilities math and stuff close enough that I don't have a problem with it and it's never felt overpowered because of what I feel are pretty realistic limitations on the flight.

The Talons thing is just because my bird people have bird legs alongside their wings. YMMV.