If anyone is interested in space flight simulation, there is a FREE simulator download called Orbiter. I have it and it is awesome. It has a bit of a learning curve however. But that's only because it is very realistic. You can fly spaceships anywhere in the solar system. One fascinating thing about it is how that it simulates both space flight and atmospheric flight. You can take off from the Earth's surface and do atmospheric flight and go into space as far into the solar system as you want to. By the way, atmospheric flight is simulated on a number of other planets and moons.
Just the other day I took off from the surface of Titan, a moon of Saturn. Its atmosphere is denser than Earths and that fact is well simulated in this program. The program also simulates orbital flight mechanics. So in addition to sub-orbital flights, you can do orbital flights. If you know what your doing you can put your ship into orbit around the Earth or any other planet or large enough moon. I can do it! So, anyway, it is a fantastic simulator and I just thought I would mention it for whoever may be interested.