I think that the Canadair 215/415/515 series may be the only purpose-designed firefighting aircraft. The rest are all converted from military and airliners. Amp

I think that the Canadair 215/415/515 series may be the only purpose-designed firefighting aircraft. The rest are all converted from military and airliners. Amphibious waterbombers are getting rare, old Catalinas are the other main ones.