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| 737 Classic | |
|---|---|
| Name | 737 Classic |
| Caption | Boeing 737 Classic series |
| Type | Narrow-body airliner |
| Manufacturer | Boeing |
| First flight | 1984 |
| Introduced | 1984 |
| Status | In service |
| Produced | 1980s–1990s |
737 Classic The 737 Classic is a family of narrow-body airliners developed by Boeing as the second major generation of the Boeing 737 line, succeeding the Boeing 737 Original series and preceding the Boeing 737 Next Generation. It served carriers including American Airlines, British Airways, Lufthansa and United Airlines, bridging market needs between short-haul routes and emerging medium-haul networks. The Classic series was influential in airline fleet planning, competing with types such as the Airbus A320, McDonnell Douglas MD-80, Bombardier CRJ700 and Embraer ERJ‑145.
Development began at Boeing Commercial Airplanes in response to market pressure from Airbus Industrie and carriers like Southwest Airlines. Engineers adapted systems from the Boeing 737 Original while incorporating advances from projects including the Boeing 757 and Boeing 767. The design introduced CFM International CFM56 turbofan engines produced by the CFM International joint venture between General Electric and Safran Aircraft Engines (formerly Snecma), yielding improved fuel efficiency relative to the Pratt & Whitney JT8D used on Originals. Airframe revisions included a redesigned wing incorporating lessons from the Boeing 737-300 flight test program and structural work informed by testing at NASA Langley Research Center and certification oversight by the Federal Aviation Administration.
Cockpit avionics evolved with options for Honeywell flight management systems and improvements from the Collins Aerospace navigation suite; autoflight logic drew on developments used in Alaska Airlines and Delta Air Lines fleets. Passenger cabin enhancements paralleled interior programs at Iberia and KLM, while supplier relationships involved Spirit AeroSystems, Goodrich Corporation, Hamilton Sundstrand and Rockwell Collins.
The Classic family comprised the -300, -400 and -500 series, each tailored to route and capacity requirements of customers such as Aer Lingus, Air France, Cathay Pacific, Finnair and Qantas. The 737-300 balanced range and payload for carriers including US Airways and Southwest Airlines, whereas the 737-400 offered stretched fuselage options competing with the McDonnell Douglas MD-88 for medium-density trunk routes used by British Airways and Virgin Atlantic. The 737-500 targeted replacement of Boeing 737-200 and short-field operations sought by regional operators like Olympic Airlines and Aloha Airlines. Special mission conversions were carried out for customers such as United States Air Force contractors and OEM modifiers including Marshall Aerospace and ST Aerospace.
Entry into service began in the mid-1980s after certification by the Federal Aviation Administration and similar approvals from European Union Aviation Safety Agency successor authorities. The Classic saw global deployment across carriers including Aeroflot, China Southern Airlines, Japan Airlines, KLM and SAS Scandinavian Airlines System, supporting hub-and-spoke networks at airports like Heathrow Airport, Hartsfield–Jackson Atlanta International Airport, Frankfurt Airport and Changi Airport. Leasing companies such as Avolon, Boeing Capital Corporation and GECAS facilitated fleet flexibility for startups like JetBlue and regional growth at Ryanair (early routes) and EasyJet (charter operations). Maintenance ecosystems engaged providers including Lufthansa Technik, SIA Engineering Company and CAE.
The Classic's operational economics influenced route planning at legacy carriers and low-cost carriers, and it played roles in pilot training programs run by institutions such as FlightSafety International and CAE. The type remained in passenger, freighter, and corporate service into the 21st century alongside newer types including the Boeing 737 Next Generation and Airbus A320neo families.
General characteristics included a two‑crew flight deck influenced by Boeing common-type policies, fuselage width shared with other 737 families, and a low‑wing monoplane configuration. Engines were variants of the CFM56 series, built with technology derived from General Electric turbofan development teams. Landing gear and hydraulic systems were supplied by vendors such as Messier-Dowty and Parker Hannifin. Avionics options included suites from Honeywell, Rockwell Collins and Thales Group with transponder and communication standards aligning with ICAO guidance. Performance figures varied by submodel: typical ranges and payloads suited operations comparable to the Airbus A319 and McDonnell Douglas MD-90.
Major operators historically included American Airlines, United Airlines, Delta Air Lines, Southwest Airlines, British Airways, Lufthansa, Air France, KLM, Japan Airlines, Qantas and Aer Lingus. Leasing lessors like ILFC (now part of AerCap), GECAS, Avolon and BOC Aviation placed large orders and managed redeliveries for airlines across North America, Europe, Asia and Oceania. Military and government operators included entities associated with Royal Air Force contractors and US Department of Defense support organizations; conversions from passenger to freighter roles were carried out by firms such as Delta TechOps and Ilyushin Finance Co. in coordination with regulators including the FAA.
The 737 Classic experienced incidents investigated by authorities including the National Transportation Safety Board and agencies analogous to the Transportation Safety Board of Canada and Australian Transport Safety Bureau. Hull-loss accidents and runway excursions involved operators such as Alaska Airlines, Garuda Indonesia, Iran Air, LOT Polish Airlines and Siberia Airlines (now Aeroflot successor carriers). Safety recommendations led to modifications overseen by FAA directives and manufacturer service bulletins issued by Boeing. Operator training and maintenance practices by Qantas engineering and Lufthansa Technik influenced fleet reliability metrics compared in industry analyses by IATA and ICAO.
The Classic series informed design lessons applied to the Boeing 737 Next Generation and later the Boeing 737 MAX, shaping engine‑airframe integration and fleet commonality policies that affected airlines such as Southwest Airlines and Ryanair in procurement strategies. Its widespread use influenced aftermarket industries represented by Lufthansa Technik, AAR Corp., ST Engineering and Airbus competitive responses. The Classic remains a subject in studies by NASA, aviation historians at Smithsonian Institution and regulatory reviews by the FAA, reflecting its role bridging the piston‑to‑jet era lineage embodied by Boeing narrowbodies and the modern single-aisle market.