Icarus IV Spaceport was a spaceport.
In 2328, this was the point of embarkation for passengers traveling to the Ingraham B Transit Station via commercial transport. Jeff Hadjikhani and David Powell traveled on the SS Kogin. (TNG-R: "Inheritance", okudagram)
This spaceport was only mentioned in writing.
The inclusion of Icarus IV
in the name suggests a connection with the comet
of the same name.