Space Only Ships
A flyable ship that cannot make landfall upon a planet. Something like the Lynx Bulk Carrier, although it doesn't necessarily have to be that large. For whatever gameplay balance reason used, a ship might not be able to land on a surface under gravity, or might not be able to use atmospheric shielding. These could be given advantages to offset the disadvantage.
- The powerful ventral thruster used to take off from a planet need not be quite so powerful.
- The ship could have a more generous thrust.
- It could be an interesting shape.
Care would have to be taken that such ships weren't sold from a planet-based shipyard.