Reinforced Wings
(Races of the Dragon, page 101, DnD 3.5)
[General]
You have strengthened the muscles of your wings.
Prerequisite
STR 13, wings and a glide or fl y speed
Benefit
You can fl y in medium armor or with a medium load. Your speed is still reduced by encumbrance due to armor or total weight.
Normal
Flying creatures can't fly in medium or heavy armor or when carrying a medium or heavy load.