You gain greater maneuverability when flying than you would normally have.
Prerequisites: Ability to fly (naturally, magically, or through shapechanging); a winged corporeal creature of size Large or larger must also have Hover or Wingover.
Benefit: Your maneuverability class while flying improves by one step—clumsy to poor, poor to average, average to good, or good to perfect. See the Flying Maneuverability table for details.
Special: You can take this feat multiple times. Each time you take the feat, your maneuverability improves by one category.
A winged corporeal creature of size Large or larger cannot exceed good maneuverability by way of this feat. A Medium winged corporeal creature with Improved Flight that increases to Large size (through creature advancement or magic) cannot use that feat until it gains Hover or Wingover as mentioned in the prerequisites above. That creature is limited to good maneuverability even if it had perfect maneuverability before advancing to Large size. A creature that reached perfect maneuverability before advancing to Large size by way of one or more uses of this feat may want to retrain its last Improved Flight feat to some other feat. See Feat Retraining.
Source: Complete Adventurer, page 110; Races of the Wild, page 151; and the Improved Maneuverability feat in Draconomicon, page 70. This feat is a rewritten blend of the aforementioned three sources to condense the three feats to one. Without the rewrite, flying creatures could skip the limitations of Improved Maneuverability by taking one of the Improved Flight feats instead. The first source is listed as Complete Adventurer because it came closer to the ideal and used the shorter and more prevalent name.