Editing ARTICLE (section)

== Development History ==

=== Original Series (1967–1988) ===
The 737 was conceived as a shorter, lower-cost twinjet to complement Boeing's 707 and 727. The initial -100 model (first flight April 9, 1967) was followed by the lengthened -200, which became more popular. Key features included:
* Pratt & Whitney JT8D low-bypass turbofan engines
* Capacity for 85–124 passengers
* Mechanical flight controls

=== Classic Series (1984–2000) ===
The 737-300/-400/-500 series introduced:
* CFM International CFM56 high-bypass turbofans
* Glass cockpit with EFIS displays
* Increased passenger capacity (up to 168)
* Improved aerodynamics and fuel efficiency

=== Next Generation (NG, 1997–2020) ===
The 737NG series represented a major redesign:
* New wing with increased span and area
* Modern avionics including LCD displays
* Revised interior with Boeing Sky Interior option
* Winglets as standard on most models
* Variants from 110 seats (-600) to 215 seats (-900ER)

=== MAX Series (2017–present) ===
The current generation features:
* CFM International LEAP-1B engines
* Advanced Technology winglets
* Boeing Sky Interior as standard
* MCAS (Maneuvering Characteristics Augmentation System)
* 12–14% better fuel efficiency than NG