CHICAGO, July 12, 2012 /PRNewswire/ -- Boeing (NYSE: BA) announced today an order by United Continental Holdings, Inc. (NYSE: UAL) and its wholly owned subsidiary, United Air Lines, Inc., for 150 737 airplanes, including 100 of the new 737 MAX 9. United, the world's largest airline by traffic, is the latest carrier to choose the newest member of the 737 family, which today eclipsed 10,000 orders overall. The deal, worth $14.7 billion at list prices, also includes 50 Next Generation 737-900ERs (Extended-Range). "This order is a major step in building the world's leading airline, and we look forward to offering our customers the modern features and reliability of new Boeing airplanes, while also making our fleet more fuel efficient and environmentally friendly," said Jeff Smisek, United's President and CEO. "New aircraft deliveries support our flexible fleet plan, permitting us to tailor future capacity up or down, based on changes in demand or other market conditions." United is the North American launch customer for the 737 MAX 9. The order continues the momentum for the 737 MAX, which now has more than 1,200 orders and commitments from 18 customers. Counting all variants, the 737 program now stands at 10,039 orders, further cementing the 737 as the undisputed best-selling jetliner in the world. "United and Boeing share a rich history together and we are delighted United has chosen the 737 for its future fleet, renewing our partnership for decades to come," said Ray Conner, president and CEO of Boeing Commercial Airplanes. "We believe the 737 provides unsurpassed quality and value in the market and will provide efficiencies and other benefits to United's operations." The Next-Generation 737 is the most fuel-efficient and reliable single-aisle airplane today with an eight percent per-seat operating cost over the nearest competitor. The 737 MAX builds on these strengths with big advances in fuel-efficiency and environmental performance. Equipped with new LEAP-1B engines from CFM International and improvements such as the Advanced Technology Winglet, the MAX reduces fuel burn and CO2 emissions by 13 percent while maintaining the eight percent operating cost advantage over future competition.