Ellias, you're thinking of the NPC Transport npc. I believe Mohit is trying to use the Shuttle-to-Orbit NPC, which can be found outside the spaceport. Though, I don't know if that NPC-srevice is implemented, or not.
Yes, I know which one he meant. Though I haven't used it myself, I'm sure I've seen others post similar questions and those that responded seemed to imply that the NPC in question needed to be NPC controlled, and these were only inside the NPC starport.
NPC Transport is inside the spaceport.. shuttle to orbit NPC is outside. So in this case, the outdoor NPC is the correct one. And yes, it should still be functioning properly, so most likely the ship has just not yet been assigned, or is not located at the planet.