Invicta Airways and their Vikings. I liked those.
I enjoyed taking leave from Germany to LGW in a Viscount - 800 trooping flight but I can't remember the operator. It was about the only time I didn't mind going back to camp either - just for for another ride in the Viscount.
The 1-11's of Dan Air on LGW - ABZ route were a joy albeit at 0700 and commonly known as the red-eye special.
BIA to Jersey.
So nice all of them