In 1974 Smith became aware that the Johnson Flying Service was looking to sell its assets. The business was a small supplemental carrier that had two 94-passenger Lockheed L-188 Electra four-engine turbo-prop passenger aircraft.  More importantly, it held a supplemental air carrier operating certificate which allowed it to operate as an airline. After significant deliberation, the Civil Aeronautics Board approved the transfer in 1975. Evergreen International Airlines was officially formed and incorporated on 16 April 1975 as a subsidiary of Evergreen Helicopters, Inc.  The business subsequently continued to expand and split into a number of subsidiary divisions.  The main subsidiary was Evergreen International Airlines which operated the Boeing 747 as a cargo or tanker aircraft to destinations around the world. The 747-200 " Evergreen Supertanker " can deliver 20,000 gallons of water on a fire, nearly ten times what can be delivered by a conventional forest service tanker such as the Lockheed P-3 Orion .