The'd all gone by the late 1980s, sadly, HD. They'd moved on from CL-44s by my day (think Transmerridian and Tradewinds acquired some of the fleet) but SW and FT DC-8s and 747s made a colourful addition to an airport ramp. Slick were no more by the late 1960s I think.
Saturn Airways! DC-8s and L-100s!