I think you got the last part wrong. Airplanes have GPS and they know where they are on the runway, where the taxiways are and so on for all the airports they o

I think you got the last part wrong. Airplanes have GPS and they know where they are on the runway, where the taxiways are and so on for all the airports they operate in. Just as they can take off in low visibility, they can also maneuver. And airports have ground radars that know where every plane on the ground is, even if the ground controllers are able to see the planes with their own eyes. Otherwise, in a lot of places airplanes wouldn't land pretty often :)