Visitors watch a Brazilian Air Force Embraer C-390 Millennium take part in an air display.JUSTIN TALLIS/AFP via Getty ImagesInterest in Brazil's C-390 cargo plane is growing, competing with the US' C-130 Hercules in demand.While Embraer's C-390 hasn't overtaken Lockheed's C-130, its worldwide presence is on the rise.The Netherlands and Austria bought nine C-390 Millenium aircraft in a joint deal in July.America's tried-and-true C-130 Hercules cargo plane is facing stiff competition from Brazil's new C-390 Millennium as demand for the Brazilian-built workhorse cargo plane builds.Lockheed Martin's C-130 turboprop makes up a fifth of the global military transport fleet, according to aviation data provider Cirium.While Embraer is far from edging out Lockheed in the global aviation market, the jet-powered C-390 is giving US cargo planes a run for their money.Cargo planes are essential for fast-lifting the combat vehicles and ammunition troops depend on, and they can double as jump platforms for paratroopers.