Iac as rolled up 30+ years ago: A551301-B. Not sure how we get a class A port on a world with a population of about 3000 people. So...this is now the family retreat for the family that owns Antares Shipping and Trade Speculators, a large corporation in the D'Arlee Quadrant. I have several pages of notes on them and even have some logos. I had a lot more time to create game stuff in college than I recall!
So, in the intervening years, and reading on various Traveller forums, I am going with the 3,000 is just the full-time residents. There are over 10,000 SPA employees at the starport, as well as almost that many in various manufacturing and other support services to the port. There is a high port as well.
The port is entirely Imperium owned and operated, and is a small city unto itself. As I rolled up a couple of NPCs using the JTAS 19, "Skyport Authority" by the wonderful John M. Ford, I also envision this career can send characters all over. So most of the port employees are mostly transient, performing their term or terms and then moving on.
The family (hmm, no notes on the name, I shall have to get some of that taken care of in a post where I detail the conglomerate) basically owns the planet, and has several large estates. A large staff is also part of the population. Can't have upper level families doing their own laundry now!
So perhaps if the snow actually comes down (threats of snowmagedden so far have not materialized, but I may wake up tomorrow in a foot of snow), I'll dig up those notes. I think I can make that work in the current game I am playing as well.
As I do not expect my players to actually stop at the planet, this is probably enough of a description to go on. Their ship does have wilderness refueling and refining capacity, so I believe they will just dip into one of the two gas giants for a few days to refuel.
Just realized I probably should indicate that this is a F6 V star, the main world is in orbit 4, and there are small stations and stuff all over. With a tech level of B, there is probably a fair amount of interstellar traffic. Heck - they probably import the hydrogen from the gas giants or belts (two of each). Yeah - I can stick a few of those 0-Hr stations in various places in case they want to visit those. I'll stick a few on all the gas giants so that they can either wilderness refuel or buy fuel and get off the ship for a bit of a stretch.