It seems the -300 model of the One-Eleven was somehow a little more capable than the -400, or the rest. There weren't many built, but they included Laker's fleet of five. Notably when Laker went under these were bought by British Caledonian, who concurrently disposed of their pioneer, same-sized -200 series aircraft to buyers in the USA; there must have been some advantage in them doing the changeover.