747-400 Global Supertanker * With black wood stand and logoBoeing 747 Global Super Tanker airplane model. Global Super Tankers aircraft is a 747 400, tail number 944, dubbed The Spirit of John Muir after the renowned naturalist who became known as the father of (Americas) natural parks. The aircraft is the world's largest air tanker, operating in the firefighting category of Very Large Air Tanker (VLAT). The air tanker was first certified for firefighting service by the United States Interagency Air Tanker