Everyone seems to be talking in circles on this idea, which is a shame because there really are some nice options on the previous pages. My personal opinion is that (already been stated a few times) if the player base wants to have fast travel we should have to work for it, players build transport hubs that need daily maintenance in order to continue to function. If one falls into disrepair then they will have to get x people to gather materials and repair it or it crumbles and is essentially useless. A limit would need to be set on how many hubs could be placed in any given zone or we could have a problem of people littering the area with partially constructed transport hubs. As far as air travel goes, I think the same should apply. Players should have to make/tame/construct their flying mounts, they should need daily maintenance and there absolutely should be other native dangers flying in there air that can and will attack you and your mount. They should also have a "life bar" of their own, which if depleted would render them trash. Again just my thoughts on this, there are a few other excellent ideas posted previously and you are doing yourself a disservice if you haven't read thru the previous three pages.