[quote=MrDidact]
Well yeah but there's animal quick and then there's machine quick. St. Michael is a PC and an Angelic being, its much harder to swallow that creatures like Dragons or Griffins can go airplane speed, they may be magic but they still have to follow a few biological rules.
[/quote]

Horin is powered by divine energy so his flight speed is increased by that. When it comes to supernatural powers almost anything can be possible.