If you need a large commercial-scale short-haul (oribital up to in-system although for reasons mentioned below a journey of more than a day wouldn't be feasible) passenger transport, then consider these floorplans.
Beautifully-drawn with square grid, hex grin and plain versions included, as well as the 360 degree view that's particularly good if you have access to a computer where you are playing and can show your players what their characters see, the shuttle can carry around 50 passengers in reasonable comfort (more legroom than most aircraft) as well as cargo/luggage.
The crew compartment has four seats, each with appropriate consoles. If there is any access to engineering spaces, that's not shown. There also appears to be no scope for 'in-flight service' although as there are only 2 washrooms, you'd better go easy on the drinks!
It's a really nice set of plans, the sort that you almost want to write an adventure specifically for - and indeed there is one suggestion for a prisoner escape/hostage scenario included. Crashes or other malfunctions are also good, or perhaps an outbreak of disease means the shuttle is quarantined... think I'll stop writing the review and get my plotbook!