The main consumer base for aluminum is the transportation industry, which accounts for about 20% of total aluminum consumption. Aluminum is used in the production of cars, trucks, airplanes, ships, and trains, as well as in the construction of bridges and other transportation infrastructure. The second-largest consumer of aluminum is the building and construction industry, which accounts for about 18% of total consumption. Aluminum is used in the production of window frames, doors, siding, roofing, and other building materials. The third-largest consumer of aluminum is the packaging industry, which accounts for about 15% of total consumption. Aluminum is used in the production of beverage cans, food containers, and other packaging materials.