To fly in space, orbit variants (English: the sub-orbital spaceflight) Spaceship into outer space and then return to the surface world, not to the main orbit. But for a space flight orbit.
To fly in space, orbiting a small (English: sub-orbital spaceflight) spacecraft into outer space. Then it returns to the Earth's surface up into orbit without major. But for the space shuttle main earth orbit.
In a space flight orbit digest (English: sub-orbital spaceflight) spacecraft into space outside. Then return to the earth's surface without up to the main, orbit. But for space flight orbit design principle.