Boeing 737
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| Boeing 737 | |
|---|---|
| Name | Boeing 737 |
| Type | Narrow-body airliner |
| Manufacturer | Boeing Commercial Airplanes |
| First flight | 1967-04-09 |
| Introduced | 1968 |
| Status | In service |
| Produced | 1967–present |
Boeing 737 is a family of single-aisle short- to medium-range jet airliners designed and produced by Boeing Commercial Airplanes. Developed to compete with contemporaries in the 1960s, the 737 evolved through multiple generations to become one of the best-selling jetliners in history. The type has been widely adopted by major carriers, low-cost airlines, leasing companies, and several air forces worldwide.
Development
The 737 was conceived in the mid-1960s within Boeing Commercial Airplanes as a response to market demands addressed by companies such as Douglas Aircraft Company and British European Airways. Early development involved collaboration among engineers influenced by projects like the Boeing 707 and Boeing 727, while industrial partners included suppliers tied to General Electric and Pratt & Whitney. Certification testing occurred under oversight by authorities including the Federal Aviation Administration and aviation regulators in United Kingdom and Germany, with maiden flights watched by representatives from Pan American World Airways and United Airlines. Subsequent development milestones intersected with events such as order announcements from Southwest Airlines and KLM Royal Dutch Airlines and strategic shifts prompted by competition from Airbus and its A320 family.
Design
The 737's design emphasizes a low-wing monoplane configuration with a forward fuselage and twin turbofan engines mounted beneath the wings, drawing on aerodynamic research from NASA and testing facilities at institutions like Langley Research Center. Structural components were produced by contractors linked to Spirit AeroSystems and Rockwell International, while avionics integrated systems from suppliers such as Honeywell and Rockwell Collins. Cabins reflect interior concepts adopted by operators like Ryanair and British Airways, and performance standards were shaped by certification protocols from European Union Aviation Safety Agency and Civil Aviation Administration of China. Design evolution incorporated lessons from incidents involving American Airlines and Japan Airlines, prompting changes to flight control logic and crew procedures influenced by training programs at facilities like CAE and FlightSafety International.
Operational History
The 737 entered service with airlines including Lufthansa and United Airlines, rapidly becoming a mainstay on domestic routes served by carriers such as Delta Air Lines and Southwest Airlines. Fleet expansions often coincided with industry events like the OPEC oil embargo-era route restructuring and later low-cost carrier growth exemplified by easyJet and Norwegian Air Shuttle. Operators deployed the 737 in varied roles from short-haul networks of SAS and Iberia to transcontinental services by American Airlines. Major airline group orders and lease transactions involved entities like Avolon and Air Lease Corporation, with operational metrics tracked by organizations including International Air Transport Association and FlightGlobal.
Variants
Over its production life the type developed through several generations, with designations that include Classic-era and Next-Generation models and a modern re-engined family. Variant rollout attracted orders from carriers such as Korean Air and Qantas, while frequency of production and upgrades reflected market competition from Airbus A320neo family and legacy models like the McDonnell Douglas MD-80. Specialized versions served as VIP transports for governments including United States Air Force conversions and utility roles for operators such as Cathay Pacific and Turkish Airlines. Modification programs were carried out by maintenance firms like ST Aerospace and Lufthansa Technik.
Production and Orders
Manufacturing took place at facilities associated with Boeing Renton Factory and involved supply chains including firms like GE Aviation and Safran-affiliated companies. Large commercial orders were announced at airshows such as the Paris Air Show and Farnborough Airshow by purchasers like Southwest Airlines, Ryanair, and airline groups including International Consolidated Airlines Group. Leasing companies including GE Capital Aviation Services and SMBC Aviation Capital played major roles in fleet financing, while order backlogs and cancellations sometimes responded to market events like the 2008 financial crisis and pandemics that affected carriers such as Virgin Atlantic and Air Canada.
Safety and Incidents
The type's safety record has been extensively examined following accidents and high-profile incidents involving carriers like Lion Air and Ethiopian Airlines, which triggered worldwide scrutiny by regulators such as the Federal Aviation Administration and European Union Aviation Safety Agency. Investigations by agencies including the National Transportation Safety Board and national accident bureaus led to design reviews, software updates inspired by recommendations from panels including experts from MIT and Stanford University, and revised pilot training curricula at institutions like Airbus Training and CAE. Maintenance and airworthiness directives were issued to operators such as Avianca and Gol Transportes Aéreos while insurers and oversight bodies including International Civil Aviation Organization monitored implementation of corrective actions.
Operators and Military Use
Commercial operators range from major global airlines like Delta Air Lines and American Airlines to low-cost carriers including Ryanair and Southwest Airlines, and national flag carriers such as Air France and Japan Airlines. Military and government variants have been used by organizations such as the United States Air Force and air arms of nations including Brazil and Thailand for transport, training, and surveillance roles. Leasing and charter companies such as Avolon and Air Lease Corporation have facilitated operator fleet changes, and airport networks serving hubs like Hartsfield–Jackson Atlanta International Airport and Beijing Capital International Airport host substantial 737 fleets.