I think the last one to operate was an Air Plus Comet weekly charter but that stopped about three or four years ago , maybe more
The US charter market was mainly winter and almost dedicated to US pensioners looking for a tranquil winter on the Costa del Sol - Tour operators like Grand Circle were the main users - however they started to negotiate with Iberia and got better dealks and more flexibility
Then of course , many years ago, there was Spantax ................