Flyby Attack( Monster Manual v.3.5, p. 303)
A creature with this feat can attack on the wing.
Great Flyby Attack (SS) , Improved Flyby Attack (EL) , Improved Flyby Attack (SS) , Wing Expert (RDr) ,
When flying, the creature can take a move action (including a dive) and another standard action at any point during the move. The creature cannot take a second move action during a round when it makes a flyby attack.
Without this feat, the creature takes a standard action either before or after its move.