"This is a great day in the history of our long and enduring partnership with Rostechnology," said Marlin Dailey, vice president of Sales, Boeing Commercial Airplanes. "Today's order for 737-700s, 737-800s and 737-900ERs underscores Rostechnology's confidence in the world's most successful single-aisle airplane. The entire Next-Generation 737 family offers superior operating economics and the 737-900ER has the best seat mile cost of any single-aisle airplane and provides our Next-Generation 737 customers with a compelling low-risk growth opportunity." Rostechnology 737s will be delivered with the all-new 737 Boeing Sky Interior. Inspired by the passenger experience, it promises to redefine the 737 travel experience. In addition to the new design, Boeing also announced a performance improvement package offering a 2 percent reduction in fuel consumption through various airframe and engine improvements.