The youtube video above explains that (again in German). The start/landing system with two 'poles' was designed over a long time to allow realistic angles of th

The youtube video above explains that (again in German). The start/landing system with two 'poles' was designed over a long time to allow realistic angles of the plane (i.e. nose up during descend/landing). Are those things disconnected later? I'm pretty sure, yes. The actual mechanism wasn't shown in the videos I've seen, but I expect those planes to be able to taxi to the runways, connect and lift off. After take off the planes are brought behind the scenery in a special area that allows to store/move/hide the planes. The video even says that it should be possible to change the direction of the start/landing.