Package holidays started to grow in popularity in the mid 60s, often using old, second-hand piston or turbo-prop aircraft. June 1967 changed all that when two UK-registered charter aircraft crashed at Stockport and Perpignan within 24 hours of eachother.
Due to press comment, the old aircraft were quickly replaced by jets such as One-Elevens, 737s and Comets. Brochures featured pictures of jet aircraft, and it took some years for the term 'charter airline' to return to respectability.