On the Nor-class of space stations, there exist at least six landing pads that fit this description. Deep Space 9, when placed under Federation control, had these pads converted to launch runabouts. The pads consisted of an upper door that opened, and an elevator that lifted the runabout to the outer hull's surface. The elevator could then be left raised to accept other incoming traffic. There was a docking airlock that could be attached to the landed craft. (Star Trek: Deep Space Nine)