On the Fly

On the Fly is an Achievement/Trophy in BioShock Infinite. The Achievement is worth 10 Gamer Score and the Trophy is bronze.

Requirements
The player will have to kill 30 enemies while riding the Sky-Line.

Strategy

 * Use weapons that are easy to aim, like the Machine Gun or RPG, as weapons like the Sniper Rifle and Hand Cannon might be hard to get a shot with, as the player is constantly moving and they require a clear aim.
 * RPGs and Volley Gun cause explosions, meaning that groups of enemies can be killed at once
 * The player can slow themselves down on the Sky-Line, making getting the kills much easier.
 * Human enemies (ex. Soldiers) are the easiest to kill.
 * Play on the Easy difficulty setting to kill enemies with less damage.
 * The player can abuse the checkpoints in order to get this Achievement/Trophy. Find a location with enemies and a Sky-Line and simply kill everyone from the Sky-Line and reload your last save to start again. A great places for this are:
 * After leaving the Hall of Heroes towards the Patriot's Pavilion.
 * The main bridge of the Hand of the Prophet.

Behind the Scenes

 * The term "on the fly" refers to something that is in motion or in the progress of change.
 * The Achievement/Trophy icon depicts a man dressed in a top hat and tuxedo, riding a Sky-Line while holding a flintlock.