Here is an image of the docking of the delta-winged spacecraft "The Delta Glider" to Atlantis over eastern Africa. The Delta Glider is a hypothetical "single-stage to orbit" spacecraft which comes with ORBITER. It is a useful way to "get your feet wet" in the program, as it is a lot easier to fly and has a lot more capability in terms of where it can fly (you can fly it to the moon if you so desire).