Since our current Pandemic wasn’t enough to worry about flying over the California skies all of last week, this week and for the foreseeable future the 747 Supertanker is one of several aerial firefighting airtankers 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.