I would say that this feat could be taken at any time, if after first level, they would need to be RPed as growing. This feat would allow said planetouched to have the ability to fly or land at any time (similar to avarial elves).Outsider Wings [general]
You have sprouted wings appropriate to your heritage, revealing the power of your supernatural bloodline.
Prerequisites: Aasimar or tiefling, base Fortitude, Reflex, and Will saves +2, Celestial Bloodline or Fiendish Bloodline (feats).
Benefit: You gain wings, allowing you to fly at your land speed (average maneuverability). A medium or heavy load that would reduce your land speed reduces your fly speed a proportionate amount.
This feat would more than likely HAVE to have a kismet cost, I would say -100 kismet here, but this could be increased/decreased. Planetouched already cost a large amount of kismet and this would add something else to their abilities, as well as taking away a valuable feat point.
Other penalties could possibly be:
-2 to dex (due to it being harder to keep your balance)
-25 to carry wt (due to not being able to carry much and still fly)
Feedback is always welcome,
Thanks,