McClintock worked briefly for a firm called Air Contractors, but resigned over a policy issue – that they would only carry cargo, not passengers. He was considered for secretary of the RHS, but there was a delay – in which time a friend offered him a job at the Coal Utilisation Council, where he remained until his retirement in the late 1960s. He said at the end of his life that he had never applied for a job, and that offers had always come to him.·
