Boeing won United Airlines order for 40 of its smallest jetliners - 737-700s - thwarting Bombardier's bid to land a marquee North American customer for its struggling C Series model. The order is valued at $3.22 billion based on list prices, but airlines get large discounts on big orders so the real price is likely around $1.37 billion. Sales of the Canadian-made C Series, which Bombardier is using to target the 100- to 150-seat market, have been thwarted by production delays and competition from Boeing and Airbus.