In our last game when asked "Why he didn't just fly over the city walls and avoid the throng wishing to pay respects to the dead King?" my Drake replied that "...ballistae bolts are generally not good for your health."
Folk tend to get nervous when flying, fire-breathing critters wing about willy-nilly overhead.
The logic of the world can be so deadly if defied : )
So thats also a good point to everyone who brought it up. Flight in your games existed in the logic of your worlds, not in a realm of mechanics alone. Thank you everyone who brought this up.
To use a video game example (don't worry it will be a tasteful one.) way back, when I used to have a Elder Scrolls: Morrowind character, there were items and spells of flight. This was useful b/c it helped me navigate that hellscape of a island. When I got to playing the squeal Oblivion, I came across a book or newspaper saying the emperor had declared Flight Spells and Items illegal in the country of Cyrodil (or something). This was I think a great use of in game logic to justify the removal of these very useful items.