Note to port the SGI flight demo to Linux.

 There is somewhat of an archive of 1 version of the SGI flight simulator.

https://github.com/remileonard/oldflight/tree/main

Seem to recall the Onyx had a higher end version with more polygons.  The F-15 model had real curves.  It also had a 747 model.

The dusk lighting was really good.  There were somewhat of a few frames of a night mode.