My first attempt at startrails. Obviously far from perfect, if it was worth the effort I may have tried to remove the plane trail. The clouds moved in (as you can see at the bottom) about half way through the exposures, cutting about 300+ frames to 168 usable frames. I added a frame from half an hour earlier, just to give it some colour.
168 x 30 secs, ISO 100, f/4, images stacked in startrails.exe