Originally Posted by
FFHKG
If my memory is correct, I think NorthEast Airlines with their yellow tails (later to become part of BEA) used to fly LPL to Klagenfurt in the seventies so it was served from UK regional airports in the past.
The former Northeast Airlines if I remember correctly also flew scheduled flights between LHR and Klagenfurt during the late 60's and early 70's with their Trident IE's.