Some great ideas just don’t scale-up economically. I have a friend who, back in the 20-teens, flew left-seat in Global Supertankers: B747-400s gutted and crammed with liquid tanks and high-pressure pumps. The beast was capable of delivering nearly 20,000 gallons of pressurized water/retardant on wildfires, in one pass. It could be on station almost anywhere in the world in 20 hours. Sadly, the owner (Evergreen) had financial problems and reverted and sold their last 747 in 2021. Sure could use one in California these days