A flying mount is an exceptional asset to the long-distance traveller. Able to
bypass such obstacles as forests, deserts, and even mountains, the rider can
soar over difficult terrain in any direction they choose. 
Syntax: use overland flight at <direction> <distance>
<direction> is any of the eight compass directions
<distance> is either short, medium or long
If you happen to have the 'location memory' skill, you can also use this skill
to fly to a known location. Anyone can use this skill to fly to a nearby ferry
dock with the target 'ferry'.