Just a small thing. Another technique that I like -- not nearly so widely used as // but still -- is to put stops in all caps and transits in lower case, e.g., OSL-doh-NBO. Why? The first thing I do when someone asks for advice about an itinerary is copy it and paste it into the Great Circle Mapper for a visual interpretation of the routing. The GCM doesn't care about case but it does refuse to recognise (for example) xDOH so I've then got to strip out the x's and any other extraneous info that people sometimes include (e.g., airline codes). The point is that when you're asking for help, doesn't it make sense to keep things as simple as possible?