Flying models follow the rules Swiftstride. In addition, flying units containing two or more models follow the following rules for Skirmishers: Skirmish Formation, Skirmishers & Charging, Free Reform, Fire on the March, Light Troops.
Units made up entirely of models that can fly can move or charge normally on the ground, using their Movement value, or instead choose to fly. The distance the model can fly is listed in the brackets.
A unit that flies can move over other units and terrain as it does so, treating the entire move as taking place over open ground. It may not finish the move on top of another unit or in impassable terrain. Models that Fly can make a flying charge over intervening units and terrain as long as they can draw Line of Sight to their target as normal. Flying units may march as normal.