Boeing Commercial Airplanes first-quarter revenue increased to $12.7bn on higher 787 and 737 deliveries. First-quarter operating margin improved to 11.8% reflecting the delivery volume and mix and lower period costs partially offset by higher R&D. During the quarter, the 787 program reached a 10 per month production rate and completed preliminary design review on the 787-10. The company selected the Everett, Washington site as the location for a new composite wing center for the 777X. In April, the 737 program reached a production rate of 42 per month. Commercial Airplanes booked 235 net orders during the quarter. Backlog remains strong with over 5,100 airplanes valued at $374bn.