 Most of these were phased out of service in 1968/1969, the last aircraft being withdrawn in 1973.A second batch of 100 Mk.6 aircraft (J-1101 to J-1200) were built under licence by a consortium of Swiss aviation companies, including Eidgenössische Flugzeugwerke Emmen, Pilatus Aircraft and Flug- und Fahrzeugwerke Altenrhein.Aircraft from this batch were in use from 1951 to 1974, and were retained in storage until 1988.