Afternoon PDT Phil Pugliese,
 
My apologies for not editing my response back to the original post and for not being clear in my post.
 
If a planet does not have any sort of permanent ground presence I can see that it probably has only an orbital port.
 
Here is how I think ports may be established:
 
The inhabitants start with a ground installation to reach orbit. Expanding throughout their system they establish orbital facilities. In Traveller once the jump drive comes on-line one or more of the orbital facilities get upgrade to a star port and/or new facilities get built. Ground facilities for the original space program may or may not be upgraded.
 
Worlds that are being terra-formed or be colonized might have orbital facilities first and then have ground facilities built later.
 
Tom Rux
 

From: "Phil Pugliese (via tml list)" <xxxxxx@simplelists.com>
To: "TML" <xxxxxx@simplelists.com>
Sent: Saturday, August 12, 2017 7:31:54 AM
Subject: Re: [TML] What class of Port is this?


Clarification;

When I said, " I can see where it might happen but I think it's be pretty rare."
I meant, "It would be pretty rare, but not unprecedented, to find a planetary HiPort w/o a DownPort".

p.s. there's also Shionthy in the 'Marches where, according to canon the red zone was applied due to 'shards' of antimatter present in the system's asteroid belt. Apparently a 'leftover' from a battle during 'Grandfather's War' that shattered a planet that had previously been present where the 'belt is now.

-----------------------------------------------------------------------------------------
On Fri, 8/11/17,  <tmr0195@comcast.net> wrote:

 Subject: Re: [TML] What class of Port is this?
 To: "TML" <xxxxxx@simplelists.com>
 Date: Friday, August 11, 2017, 10:35 PM
 
 Evening
 PDT,
 
 If there are no ground installations
 because anything of value is mined from asteroids I can see
 a planet having only an orbital port facility. However, if
 there are facilities on a planet's surface I image there
 is some sort of port to allow transfer of material and
 personnel that only allows foreign vessels to dock at
 orbital facilities.
 
 Tom Rux
 
 From: "Phil
 Pugliese (via tml list)"
 <xxxxxx@simplelists.com>
 To:
 "TML" <xxxxxx@simplelists.com>
 Sent: Friday, August 11, 2017 4:30:28
 PM
 Subject: Re: [TML] What class of
 Port is this?
 
 
 --------------------------------------------
 On Fri, 8/11/17, via tml list
 <xxxxxx@simplelists.com> wrote:
 
  Subject: Re:
 [TML] What class of Port is this?
  To:
 xxxxxx@simplelists.com
  Date: Friday, August
 11, 2017, 2:13 PM
  
  On 11
 Aug 2017 at 17:37, Phil
  Pugliese (via tml
 list) wrote:
  
  >
 p.s.
  Anyone ever think about a situation
 where a planet might
  have a
  > HiPort but no DownPort?
  
  Well, a size 0 world might
 do
  that. Ditto for worlds with the
  stranger
  atmosphere
 types.
  
  And
  that's almost certainly the case with all
 red-zoned
  worlds and
  some amber.
  
  There could be other reasons as well, say
  there's a religion that
  considers the
  planet holy
 (think Mecca). They might only allow
  specially crewed and putified shuttles to
  land.
  
  And some of the
  stricter
 government types might have similar
  restrictions.
 
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Well,
 'asteroid' belts aren't really worlds or planets
 in my book.
 Even if a starport was
 'anchored' to one of the larger 'rocks', I
 don't think it would actually be considered a down
 port.
 Not as long as unstreamlined ships
 could dock.
 And there are red zone worlds
 that must have down ports, Andory & Candor in
 5sisters/spinward marches for example.
 They
 are Droyne worlds that are capable of starflight. In fact
 there's even a Droyne trading company hq'd there!
 Also, elsewhere in the 'Marches,
 there's Victoria, (where the weird starship in the 1st
 CT LBB double adventure, AnnicNova, came from.
 I believe that the writeup for the system was
 published in a CT JTAS article.
 Lastly, a
 lot would depend on the specifics of the Imperial Charter
 granted to a specific system. I can see where the ImpGov
 would insist on a downport, w/ it's attendant extrality
 zone, for various reasons.
 
 I can see where it might happen but I
 think it's be pretty rare.
 
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