You can do it for any airline or combination of airlines (and/or other filter criteria). First do a search with actual origin and destination cities that are served by the airline(s). After the results page comes up, change the destination to something more geographically broad, like "United States" or "Europe" etc. This will then switch to the map view. The region you specify doesn't even have to be exact, once you're in map view, you can scroll the map a bit and it will widen the results to the section of the map that's in view.