Here's todays pic: The Comet - Single Stage to Orbit Aerospace Transport.
This is an older design, in universe, that isn't as common as some newer transports, though still makes an appearance from time to time in the background. Intentionally designed after the X-33: http://en.wikipedia.org/wiki/X-33
as well as John Eaves concept art for the vessel seen flying over the moon in the opening scene of Enterprise. I have the outline for a side view, but it's in another file. I'll try to grab it and update this one later on.