In 1957 he opened DeNardo and McFarland Weather Services with his friend David G. McFarland, whom he met in the Air Force. "DeNardo and McFarland", located at the Allegheny County Airport, would sell weather forecasts to the Pittsburgh corporate aviation community (17 clients including Westinghouse, Rust Eng. and ALCOA), private aviation services, gas and electric utilities, construction and local radio stations. The company also had a contract with Allegheny County, Pennsylvania to consult on air quality issues. Many of the US Weather Services (NWS)personnel located at the airport would work part-time for DeNardo & McFarland, one flight down.