SEATTLE - Boeing is pleased that China Southern Airlines has announced a commitment to purchase 80 737s. The commitment includes a combination of 30 Next-Generation 737s and 50 737 MAX airplanes, valued at $8.38 billion at current list prices.     “China Southern’s commitment is a solid endorsement of the popularity of the Next-Generation 737 and 737 MAX,” said Ihssane Mounir, senior vice president, Northeast Asia Sales, Boeing Commercial Airplanes. “We share an enduring partnership with China Southern and we are excited to see that the 737 airplanes will play an important role in their continued success.” The order will be posted on Boeing’s Orders & Deliveries website once all contingencies are cleared.