Up until very recently, Air Contractors 727's did a lot of UK-Eire horse flying. Had previously been done with the Electra. I think there was a proposal for someone like Raf-Avia or Eminex to do them on the antonov 72? (strange looking one with the engines over the wing) as you can walk on walk off so saving the horses a hi loader trip. Not sure who is doing them now.