IEA, Potential reductions in metals demand in the United States commercial aircraft fleet from the use of 3D printing, 2050, IEA, Paris https://www.iea.org/data-and-statistics/charts/potential-reductions-in-metals-demand-in-the-united-states-commercial-aircraft-fleet-from-the-use-of-3d-printing-2050, Licence: CC BY 4.0