If you're at the point in the game where you've got full control over the Starflight Express, then the observatory has already ceased to exist.
There is no town called Starflight. The 'Starflight Express' is a magical train used by the Celestials. If you are told to go there during the main game, first you will find it on the map between Angel Falls and Stornway.
the house at the top has a thug in it and he says something about a fig. the house has a big hole in the back.
there isn't a flying boat, but you can obtain a ship after completing the Bloomingdale story and the starflight express after completing a post-game quest
That depends on where you are in the story. You start off in the Observatory, then you descend to the mortal world to start your job as Guardian of Angel Falls. --- SPOILERS FOLLOW --- You will return to the Observatory several times as part of the story. You might be able to return there via the Starflight Express (from the blue shining trees) if you have reached Alltrades Abbey. If you've already beaten the story, then the Observatory is gone.
post game levitan talk to jona 4 more info
You can change your vocation at Alltrades Abbey, which is on Newid Isle. You come there after Coffinwell and after you go back to the Observatory for the first time. The Starflight express will land there and the Abbey will be just ahead. (But you need to complete the mission there before you can change vocation.)
After you beat the game, complete a quest for Jona (rebattle llevianth), Then you can ride the starflight express onto any high platue.
get the starflight exspress do story missions and grottos
You have to go back to the Starflight Express, then travel to the Northeast of the Stornway map to enter the Coffinwell region where the next story events unfold.
Sounds like you mean Chris Cringle. His house is on Cringle Coast, on the northeast of the map, the island is surrounded by rocks so you will need the Starflight Express to get there.
It is Stella's room. It is an odd, circular room with star patterns on the floor, the room has the power to open portals to places, but this is only seen once, during a DLC 'extra' quest which allows you access to the room.
It's in the center of the marshlands to the southeast of alltrades abbey. You need the starflight express to reach it. It's called fixing the sickclops and requires you to steal some titanic tincture from atlas when he's down to 700 hp or less.