With the end of the Avrocar project, he left A. V. Roe Canada early in 1962. Like many of the former employees of A.V. Roe Canada, John Frost began a new career when he left the company. He left Canada for New Zealand in 1964 where he again became part of the aviation industry; first joining the airworthiness section of the Civil Aviation Administration and headed the certification of the Waitomo PL-11 Airtruck, the first commercial aircraft developed in New Zealand. During this period, Frost also designed the Murray Air, an agricultural biplane.

Later in 1965, Frost became a technical services engineer for Air New Zealand, serving in that position for 13 years until his retirement in April, 1978. His time at Air New Zealand was very fulfilling. He was responsible for all technical activities at the airline's engineering headquarters at Mangere, New Zealand. All "Air New Zealand aircraft are showcases for the Frost ingenuity". (Daily News New Zealand, April 1978). The unique swiveling bassinets attached to the airliner's hat racks are his design along with locks that hold down pallets in the cargo hold, air-conditioning systems for the cargo bay, rest seats for air crew, toilet tap washers and gallery plugs. His most impressive design was a gigantic hydraulically operated tail dock system. After retirement, his fertile imagination continued to explore many areas. Prior to his death from a heart attack in Auckland, New Zealand on October 9, 1979 at the age of 63, John Frost was again involved in an exciting aviation project- designing and constructing, with the assistance of university students at Auckland, a human-powered aircraft. The aircraft was not completed in his lifetime but was flown after his death. With this flight, the last of John Frost's aircraft designs had come to fruition but his legacy will always be the dream of flying saucer craft that nearly came true.

Avro Canada's secret projects showed the amazing technological virtuosity and visionary promise of a remarkable team of designers lead by Frost. Unlike many of these projects, the Avrocar was actually built and came so close to success. Canada's "flying saucer" is today a historical footnote and only a memory to those who had known it; yet it was a fascinating glimpse of the future.

John Carver Meadows Frost, the unheralded creator of the Avro Canada flying saucer projects and the Chief Designer who shepherded the Avro Canada CF-100 jet fighter project to completion deserves to be recognized for his contributions to Canada's aviation heritage. The bylaws of Canada's Aviation Hall of Fame at the Reynolds-Alberta Museum, Wetaskawin, Alberta state that Canada's Aviation Hall of Fame "is open to those persons whose unselfish contributions to aviation shall have been of major benefit to Canada, and which contributions have stood the test of time." In 2001, the name of John Carver Meadows Frost is submitted to mark his legacy in the story of A.V. Roe Canada as Chief Project Designer of the Avro CF-100 Canuck and as Chief Designer of the Special Projects Group responsible for remarkable Avro Canada's VTOL programs.