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The MacBook Air is a line of Macintosh ultraportable notebook computers from Apple Inc. The Air was designed to balance both performance and portability consisting of a full-sized keyboard design a machined casing made of aluminium and a very light and thin structure. The MacBook Air is available in two sizes with the length of the diagonal display determining the model size: 13.3-inch and 11.6-inch (or 33.78 cm and 29.46 cm respectively).