The US Forest Service will have access to several models of aircraft, including a converted DC-10 jumbo jet, which can carry about five times as much flame-resistant liquid as any aircraft in regular use.  Each of the planes can carry more than 3,000 gallons of slurry while the DC-10 can hold as much as 11,600 gallons.

 http://www.spokesman.com/stories/2013/may/07/newer-planes-may-fight-fires/