First airline I ever flew with, Edinburgh-Copenhagen student charter in a DC6 in 1967.
Terribly sad.
That was I believe about 2 "Sterlings" ago. There have been Sterling bankruptcies before. I am just not sure whether once or twice. The last time would have been in the early Nineties when it operated B727s and DC-8s, and a couple of 757s.
Someone will know the history better than me. But they ran a nice and small training center at CPH. Went there for both DC-8 and 757 sim.