Boeing and Delta Air Lines on Aug 25 announced an order for 100 Next-Generation 737-900ER (extended range) airplanes. The order, with a list-price value of more than US$8.5 billion, is part of Delta\'s fleet renewal effort to replace its less efficient domestic airplanes. \"The 737-900ER is the perfect airplane to replace the older, less efficient airplanes in our single-aisle fleet,\" said Delta President Ed Bastian in a statement from Seattle. \"Reliability and fuel efficiency are direct contributors to our financial performance. The 737-900ER will provide us a reliable airplane with the lowest fuel burn in our domestic fleet.\" The Boeing 737-900ER is the newest member of the Next-Generation 737 airplane family. It also is the highest capacity, longest-range airplane in Boeing\'s single-aisle fleet. New aerodynamic and structural design changes allow the airplane to carry up to 180 passengers in a typical two-class layout. The advanced-technology wing design that helps increase fuel capacity and efficiency provides substantial economic advantages over competing models. \"We thank Delta for its confidence in the Next-Generation 737-900ER as a solution to its fleet renewal,\" said Marlin Dailey, vice president of Sales & Marketing for Boeing Commercial Airplanes. \"As an industry-leading airline, Delta\'s investment validates the continuous improvements we are making to the Next-Generation 737\'s efficiency, economics, reliability and passenger comfort.\" All of the airplanes will feature the new Boeing Sky Interior. This new interior is the latest in a series of enhancements for both airlines and passengers. It introduces new lighting and curving architecture that create a distinctive entry way. Passengers will enjoy a more open cabin feel and an environment simulated by light-emitting diode (LED) lighting. The new interior also features sculpted sidewalls and newly improved and expanded pivot bins.