Boeing 737 Family engine or configuration codes connect model suffixes, production standards, and supplier choices. 737 Original: Pratt & Whitney JT8D; 737 Classic: CFM56-3; 737 NG: CFM56-7B; 737 MAX: CFM LEAP-1B
Advantages
- Large global support ecosystem.
- Strong commonality across many short-haul airline fleets.
- Broad variant range from small-capacity to high-density missions.
Limitations
- Legacy ground-clearance constraints influence engine installation and systems design.
- Different generations have very different cockpit, engine, and operational details.