In which the earliest known broomsticks are discussed.
Calendar and Dates
A German illuminated manuscript of this period shows three warlocks dismounting their brooms, clearly before the development of the Cushioning Charm.
Interesting facts and notes
More about the development of broomsticks can be found in the chapter about racing brooms.
No spell yet devised enables wizards to fly unaided in human form.
This is canon (also DH5). The films ignore this and have people flying all over the place.
Those few Animagi who transform into winged creatures may enjoy flight, but they are a rarity. The witch or wizard who finds him- or herself transfigured into a bat may take to the air, but, having a bat's brain, they are sure to forget where they want to go the moment they take flight.
So this is a key element of the Animagus transformation - the retention of the ability to think. Why, then, did Draco Malfoy attempt to flee for the dungeons when Moody/Crouch transfigured him into a ferret during his fourth year? How did he remember that he could find help there?