The middle of the market, often abbreviated MoM, is the airliner market between the narrowbody and the widebody aircraft, a market segmentation used by Boeing Commercial Airplanes since at least 2003. Both Airbus and Boeing produce aircraft that serve this segment.

Boeing Commercial Airplanes (BCA) is a division of the Boeing Company. It designs assembles, markets, and sells commercial aircraft, including the 737, 767, 777, and 787, along with freighter and business jet variants of most. The division employs nearly 35,000 people, many working at the company's division headquarters in Renton, Washington or at more than a dozen engineering, manufacturing, and assembly facilities, notably the Everett Factory and Renton Factory, and the South Carolina Factory.