How to Tell the Differences Between Boeing's 737 Classic, NG, and MAX Families
Key Differences to Identify Boeing 737 Variants
Fuselage Length
The fuselage length of Boeing 737 aircraft varies depending on the specific model. The 737 Classic series (including the -300, -400, and -500 variants) has the shortest fuselage, while the 737 MAX series has the longest fuselage. The 737 NG series (including the -600, -700, -800, and -900 variants) falls in between.
Engines
Another key difference between the Boeing 737 families is the engines. The 737 Classic series features CFM56 or IAE V2500 engines, while the 737 NG series is powered by CFM56-7B or LEAP-1B engines. The 737 MAX series, on the other hand, uses CFM LEAP-1B engines, which are more efficient and quieter than previous engines.
Winglets
Winglets are vertical extensions at the wingtips of an aircraft. They help to reduce drag and improve fuel efficiency. The Boeing 737 Classic series has traditional winglets, while the 737 NG series and 737 MAX series have advanced technology winglets (AT Winglets) that are larger and more efficient.
Other Differences
In addition to the key differences mentioned above, there are also other subtle differences between the Boeing 737 families. These include differences in avionics, interior design, and operating characteristics.
Identifying a Boeing 737 Variant
If you're not sure which Boeing 737 variant you're looking at, there are a few ways to identify it. First, look at the fuselage length. If the aircraft is relatively short, it's likely a 737 Classic series aircraft. If it's longer, it's likely a 737 NG or 737 MAX series aircraft.
Next, look at the engines. If the engines are mounted high on the wings, it's a 737 Classic series aircraft. If the engines are mounted low on the wings, it's a 737 NG or 737 MAX series aircraft.
Finally, look at the winglets. If the winglets are traditional, it's a 737 Classic series aircraft. If the winglets are advanced technology winglets, it's a 737 NG or 737 MAX series aircraft.
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