BKS - haven't heard of that airline name for years so I looked it up:
Key Facts
- Founded: February 1952 as BKS Aero Charter
- Renamed: Became BKS Air Transport in 1953
- Final Name: Renamed Northeast Airlines in 1970
- Ceased: Fully merged into British Airways in 1976
- Bases: Leeds/Bradford and Newcastle
- Parent Group: British Air Services, later absorbed into BA