According to changes list posted by Steve... (emphasis mine)
1.
> Refuelling Orders
> ...
> Multiple spaceports or refuelling stations at the colony
will not increase the rate of refuelling.
2.
> Ordnance Transfer Orders
> ...
> Multiple spaceports or ordnance transfer stations at the colony
will not increase the rate of ordnance transfer.
3.
> Cargo Shuttle Bays
> ...
> Spaceports and Cargo Shuttle Stations can service any number of ships simultaneously but they
do not stack. In effect they count as a single Cargo Shuttle Bay for any ship at the population.
However, there is also a line
> They retain their existing bonuses to loading and unloading cargo.
Do note that this line come before "Cargo Shuttle Bays" rule post, so this may have changed...
![Undecided :-\](https://aurora2.pentarch.org/Smileys/classic/undecided.gif)
So while it appears to me that nothing stacks, I am not too sure if multiple spaceports still make cargo loading faster like in VB
![Undecided :-\](https://aurora2.pentarch.org/Smileys/classic/undecided.gif)