Kirk's Sabre was a blast at that time ! A beautiful model with a beautiful VC.
However, the VC was not clickable at all, and the plane was started with CTRL+E.
As Dhazelgrove said above, the later SectionF8 Sabre made Kirk's Sabre obsolete, by providing an external model with incredible details, and a virtual cockpit with a lot of clickable stuff (plus excellent sounds, if I remember correctly).