materials used to build aircraft
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materials used in aircraft structure, materials to build a plane, material used in aircraft, materials used in airplanes, materials used in aircraft engines, what material is used for aircraft fuselage, materials used in aircraft wings, what materials are airplanes made of, list 5 materials in aircraft construction, what is this aircraft material, what materials are planes made of, materials needed to make a paper airplane, what is this aircraft made of, material manufacture of aircraft, materials for paper airplane