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The 747 Supertanker is one of several aerial firefighting air tankers derived from various Boeing 747 models. The aircraft are rated to carry up to 19,600 US gallons (74,000 L) of fire retardant or water. They are the largest aerial firefighting aircraft in the world. Initially developed by Evergreen International Aviation, the first Supertanker was based on a 747-200 (N470EV, tanker/tail number 947), and never entered service. The second Supertanker (N479EV, tanker/tail number 979) was based on a 747-100 originally manufactured by Boeing in 1971 for Delta Air Lines. It entered service for the first time in 2009, fighting a fire in Cuenca, Spain, and made its first American operation on August 31, 2009 at the Oak Glen Fire in California. It is no longer in service. The later is now stored at Pinal Air Park in Marana, Arizona and captured during a air to ground shoot from inside a Cessna 172.
