Static Aircraft.
I have included some non-default static GA aircraft which gives the airfield a nice period feel. These are supplied by the static library made by kb, you can download the whole library here
http://www.kb-sim.com/screens_static_aircraft.html
You should install the files in the normal way, an enclosed read-me file should guide you, if you have problems. In general anything with a .bgl goes in scenery and all others go in texture!
Then add my small file Portsmouth_extra_KB_statics (the file only, not the whole folder) contained in the folder called kb_static aircraft into the main Portsmouth/scenery folder and refresh the scenery library via the FSX main menu.
You should now have a mix of different GA aircraft and a few MS default ones as well, to reflect the busy nature of Portsmouth in the 1970s.
If you chose not to use the above files, there will still be a couple of default MS aircraft to make the place look like an airfield!