In 1968, Purdue University formed charter carrier Purdue Airlines, partially to allow students from their aviation programs to gain modern jet experience. The airline operated three DC-9s (and provided crews and maintenance for Playboy magazine's executive DC-9). The airline shut down in 1971. N9339 had been leased from Air West / Hughes Airwest (1969 -1971) and was returned. The aircraft went to Republic Airlines in 1980 (Northwest Airlines after 1986). Sold to Evergreen in 2009, it was flown to Marana, AZ and broken up for parts.

Built from plans in 1970 before rights for the design were sold and Great Lakes Aircraft Company was reconstituted to produce an updated version of this 1930s popular sport trainer. N3291 was on the US Registry until the registration expired in 2012.

Former US Navy R4D-6 Bu50799 converted to a C-47J in 1964 and C-47L in 1967. Served with the Air Attaché in Athens until SOC in 1970 and bought by Carolina Aircraft of Fort Lauderdale FLA. Passed through Luton in company with N10CA (ex Bu50797) on delivery. Later sold to Aerotécnica of Venezuela as YV-C-GAI and written off near Ciudad Bolivar in May 1972.