737-900ER
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| 737-900ER | |
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| Name | 737-900ER |
| Manufacturer | Boeing Commercial Airplanes |
| Status | In production (as of 2016) |
737-900ER is a stretched, extended-range member of the Boeing 737 Next Generation family developed by Boeing Commercial Airplanes as a response to market demand for higher-capacity narrow-body airliners from carriers such as Southwest Airlines, Alaska Airlines, and Lion Air. The type integrates changes from the 737-800 and 737-900 series with additional modifications to increase range and payload while complying with regulatory standards set by the Federal Aviation Administration and international authorities such as the European Union Aviation Safety Agency. Its introduction influenced competition with models from Airbus and regional strategies of carriers like American Airlines and Delta Air Lines.
Development and Design
The program emerged as Boeing reacted to requests from airlines including Alaska Airlines, Lion Air, and United Airlines for a stretched derivative similar to developments seen in the Boeing 757 era and the evolving rivalry with Airbus A321neo. Engineers at Boeing Commercial Airplanes implemented structural reinforcements derived from the Boeing 737NG program, incorporating aerodynamic refinements first evaluated on prototypes and validated through flight testing overseen by the Federal Aviation Administration and the International Civil Aviation Organization. To meet range objectives and seating needs of carriers such as Southwest Airlines and Alaska Airlines, designers added auxiliary exit doors, strengthened landing gear influenced by lessons from the Boeing 737 Classic and Boeing 747 programs, and optimized the CFM International engines and fuel systems, referencing suppliers like CFM International and avionics partners including Honeywell International and Rockwell Collins.
Variants and Specifications
The 737-900ER retains commonality with the Boeing 737-800 but includes specific changes: an extended fuselage inspired by the 737-900, a pair of additional exit configurations agreed with regulatory agencies including the Federal Aviation Administration, and optional auxiliary fuel tanks to achieve higher range comparable to narrow-body competitors such as the Airbus A321XLR ambitions. Typical seating in a single-class layout ranges to the high 200s for low-density operators like Lion Air while two-class configurations serve legacy carriers including United Airlines and Alaska Airlines. Performance specifications emphasize a maximum takeoff weight adjusted from earlier 737NG models, range figures adapted to airline payloads, and engine thrust ratings provided by CFM International through the CFM56 series. Systems commonality with other Boeing Commercial Airplanes types eased pilot training programs often coordinated with authorities like the Federal Aviation Administration and unions such as the Air Line Pilots Association.
Operational History
After certification oversight by the Federal Aviation Administration, the 737-900ER entered service with operators including Lion Air, Alaska Airlines, United Airlines, and Southwest Airlines variants, influencing route planning for carriers like American Airlines and regional groups such as Hawaiian Airlines affiliates. The model served short- and medium-haul markets competing against Airbus narrow-bodies and regional jets from manufacturers like Embraer and Bombardier. Airlines deployed the type on dense domestic lanes in the United States, high-frequency Asia-Pacific services by Lion Air, and point-to-point networks influenced by strategies pioneered by Southwest Airlines. Fleet commonality with other Boeing 737 variants supported maintenance practices guided by original equipment manufacturers including GE Aviation partners and component suppliers like Spirit AeroSystems.
Orders and Operators
Initial commitments and firm orders derived from carriers including Lion Air, Alaska Airlines, and United Airlines, with leasing companies such as Avolon and GE Capital Aviation Services facilitating fleet placements for airlines including Southwest Airlines and smaller operators. The market response shaped follow-on orders and influenced Boeing’s narrow-body backlog in competition with Airbus SAS and leasing trends observed by firms like AerCap. Major operators structured crew and maintenance commonality programs involving training partners such as CAE and FlightSafety International to integrate the 737-900ER into expanding narrow-body fleets.
Safety and Incidents
Operational safety oversight for the 737-900ER involved national aviation authorities including the Federal Aviation Administration, European Union Aviation Safety Agency, and various accident investigation bodies such as the National Transportation Safety Board and equivalents in operating states. Reported incidents and investigations referenced aircraft handling, maintenance practices of operators like Lion Air and United Airlines, and the role of air traffic service providers exemplified by agencies such as Federal Aviation Administration and Civil Aviation Administration of China. Lessons from incidents informed safety directives and airworthiness notices issued by regulators and supported by manufacturers including Boeing Commercial Airplanes and suppliers like CFM International.