Even a relation adds no information to the map, other than perhaps "these are points on the surface of the earth which allow for an unobstructed atmospheric path to be calculated between".
There are about 28,000 aeroway=aerodrome tags, and 12,000 runways tagged. So if we wish to add relations between all possible airports, that represents about 72,000,000 great circle relations that would need to be added to cover them all. From: Aun Johnsen Sent: Sunday, October 10, 2010 10:34 AM To: OpenStreetMap Subject: Re: [OSM-talk] Flight "paths" in OSM If there is any interest of mapping airline routes, than do it with a relation between the airport nodes, as great circles can easily be calculated between two known positions. Making lines on the map is easy enough when you have the end positions, and nodes in between is not necessary at all.
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