A noted navigator, during World War II, serving in both the Royal Canadian Air Force and the Royal Air Force, Blackwood is the founder of Eastern Provincial Airways.
In the early days of EPA, Blackwood acted as pilot, operations manager and director.
In 1945 he formed Newfoundland Aero Sales and Services Inc. with James McLoughlin and Ren Goobie.
Newfoundland Aero Sales and Service was eventually sold to Maritime Central Airways in 1949.
Then on March 10, 1949 Blackwood founded Eastern Provincial Airways with a single plane, a Twin 50 Cessna.