Oh, that's easy to answer. It's the order in which Johnny Cash sang the city names in his famous song, "I've been everywhere, man..."
OK, so you know the words to that song huh? Seriously, I have no idea. I think when we moved over from the other board we simply slammed them in there to get the Board live again, probably with the idea of coming back to arrange them but time being what it is (never enough) we never completed that task - though i think we did get Australia correct (actually, Oz insisted on it).
So, now that our little secret has bubbled back to the surface (can you tell we're drowning in work?) I'll see what i can do to remedy it. While I may resort to an algorithm from the TV show NUMB3RS to figure out the best way to arrange, we will come up with something.
What's you suggestion: City name or Airport code name?