By 1953, PBA expanded with more airplanes and pilots. PBA acquired the Lockheed Model 10 Electra and used it on the Provincetown route, and then expanded service to include Cape Cod Airfield in Marstons Mills (later moved to Hyannis). Since demand for travel to Provincetown and Hyannis falls off during the winter months, in 1957 a cooperation arrangement with Naples Airlines of Naples, Florida was started, allowing the PBA aircraft to be used in Florida during the winter months. By 1958, PBA had taken over Naples Airlines and merged the two airlines together.