747-400 Global Supertanker * With stained wood stand and logoBoeing 747 400 GST Global Super Tanker firefighting 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 worlds 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