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I believe the Omni bird is pressurized as well, I know there are several pumps in there. Honestly I'm not sure.Evergreens is much more versatile then the DC-10. There are huge advantages of the pressurized system opposed to the gravity drop.
The biggest is safety. Having a pressurized system allows the Supertanker to fight fires from a higher altitude over conventional gravity drop systems.
Among other things it allows you to be more versatile in regard to what you are carrying. The Supertanker has numerous other possible functions such as oil spill containment, chemical decontamination and weather alteration.