Get historical flight's filed route

Returns information about a historical flight's filed route including coordinates, names, and types of fixes along the route. Not all flight routes can be successfully decoded by this endpoint, particularly if the flight is not entirely within the continental U.S. airspace, since this function only has access to navaids within that area. If data on a waypoint is missing then the type will be listed as "UNKNOWN". Data is available from now back to 2011-01-01T00:00:00Z.