Boeing 737 Classic

Boeing 737 Classic
Name	Boeing 737 Classic
Caption	A Ryanair Boeing 737-300 in 1999
Type	Narrow-body airliner
Manufacturer	Boeing
First flight	March 24, 1984
Introduction	1984 with KR
Status	Retired from many fleets; still in service with some operators

Boeing 737 Classic is a family of short- to medium-range narrow-body airliners produced by Boeing Commercial Airplanes as a development of the original Boeing 737 Original series designed to compete with aircraft from Airbus Industrie and McDonnell Douglas. Introduced in the mid-1980s, the Classic series incorporated newer Pratt & Whitney and CFM International turbofan technology, updated flightdeck systems used by operators such as Southwest Airlines and Ryanair, and aerodynamic refinements influenced by developments at NASA and industry partners. The family served major carriers including British Airways, Lufthansa, United Airlines, Delta Air Lines, American Airlines, and regional operators worldwide before being largely superseded by the Boeing 737 Next Generation.

Development and Design

Development began as a response to market pressure from Airbus A320 family and airline requirements from carriers like Southwest Airlines and United Airlines for improved fuel efficiency and capacity. Boeing's design team in Seattle studied modifications made on the Boeing 727 and lessons from the Boeing 757 and Boeing 767 programs. The Classic incorporated higher-bypass turbofans from Pratt & Whitney and CFM International CFM56 collaborations, leading to nacelle redesigns influenced by engineering groups at GE Aviation and Rolls-Royce. Structural changes included strengthened landing gear adapted from suppliers such as Honeywell and Goodrich Corporation, and aerodynamic tweaks informed by research at Langley Research Center and Ames Research Center. Flightdeck updates integrated avionics components sourced from Collins Aerospace, Rockwell Collins, and Honeywell enabling operators like British Airways and KLM to meet standards promoted by Federal Aviation Administration and European Union Aviation Safety Agency.

Variants

The Classic family comprised several main variants developed after consultations with airlines including Alaska Airlines, Air France, and Japan Airlines: the -300 series for increased capacity favored by low-cost carriers such as Ryanair and EasyJet; the -400 series experimental proposals; and the -500 series stretched for longer range sought by carriers like Avianca and Austrian Airlines. Manufacturers and lessors including ILFC and Aercap facilitated widespread distribution to operators including Aeroflot, China Southern Airlines, and QantasLink. Configurations often featured interiors by suppliers like Recaro and B/E Aerospace and were equipped with optional updates from Thales Group and Garmin to meet route profiles for airlines such as Finnair and SAS.

Operational History

Enter service in 1984, the Classic served fleets across North America, Europe, Asia, and South America, operating routes flown by Delta Air Lines, United Airlines, American Airlines, Southwest Airlines, Ryanair, Lufthansa, KLM, and Japan Airlines. The type supported low-cost models used by Ryanair and regional feeder operations for groups including Air Canada Express and QantasLink. Leasing companies like ILFC and GECAS moved aircraft between carriers such as Azul Brazilian Airlines and Gol Transportes Aéreos. Infrastructure initiatives at airports like London Gatwick, Chicago O'Hare International Airport, and Singapore Changi Airport accommodated Classics, influencing route networks for carriers such as Cathay Pacific and Singapore Airlines subsidiaries.

Technical Specifications

Typical Classic specifications included twin CFM International CFM56 turbofan engines developed with partners at Snecma and Snecma-Moteurs, seating for roughly 126–149 passengers depending on layout mandated by airlines such as British Airways and Southwest Airlines, and ranges suitable for domestic and regional routes served by Delta Air Lines and United Airlines. Avionics suites included components from Honeywell and Rockwell Collins with autopilot and navigation certifications overseen by the Federal Aviation Administration and European Union Aviation Safety Agency. Structural components were supplied by industrial firms like Spirit AeroSystems and Goodrich Corporation with maintenance programs managed by heavy maintenance providers including Lufthansa Technik and HAECO.

Safety and Incidents

The Classic fleet experienced incidents and accidents investigated by agencies such as the National Transportation Safety Board, the Air Accidents Investigation Branch, and the Japan Transport Safety Board. High-profile occurrences involved operators including United Airlines, American Airlines, and China Airlines, leading to safety directives coordinated with the Federal Aviation Administration and industry bodies such as the International Civil Aviation Organization. Maintenance practices from providers like Lufthansa Technik and Singapore Technologies Aerospace and pilot training programs from institutions including CAE Inc. informed recommendations adopted by carriers such as Delta Air Lines and Southwest Airlines.

Operators and Military Use

Civilian operators ranged from major network carriers (American Airlines, Delta Air Lines, United Airlines, Lufthansa, Air France) to low-cost airlines (Ryanair, EasyJet) and regional operators (Horizon Air, Skywest Airlines, Flybe). Leasing companies including ILFC, Aercap, and GECAS facilitated transfers among carriers including Aeroflot and China Southern Airlines. Some air forces and government agencies repurposed Classics for transport and training roles, with examples involving the Royal Air Force, the United States Air Force (civilian-contracted support), and various Latin American and African governments employing aircraft for troop movement and VIP transport coordinated with ministries such as the Ministry of Defence (United Kingdom) and defense departments in Argentina and Chile.

Category:Boeing aircraft