What is IGW on Boeing 737? (Increased Gross Weight)

The Increased Gross Weight (IGW) is an important variant of the Boeing 737 aircraft series that offers enhanced capabilities and performance. Designed to meet the growing demands of the aviation industry, the IGW model allows for increased payload and range, making it a popular choice among airlines worldwide. In this article, we will explore the details of the Increased Gross Weight on the Boeing 737 and how it influences the aircraft’s capabilities.

Benefits of Increased Gross Weight

With the Increased Gross Weight variant, the Boeing 737 gains several benefits that enhance its operational efficiency and flexibility. These benefits include:

1. Enhanced Payload

One of the primary advantages of the Increased Gross Weight on the Boeing 737 is the ability to carry a higher payload. The IGW variant allows airlines to transport more passengers or cargo, thereby maximizing their revenue potential per flight. Compared to the standard Boeing 737 model, the Increased Gross Weight version can carry up to 10,000 pounds of additional payload, depending on the specific variant.

This increase in payload capacity is achieved through various modifications to the aircraft’s structure and systems. These modifications may include strengthening the wings, reinforcing the fuselage, or upgrading the landing gear. By increasing the aircraft’s overall weight limit, airlines can transport more passengers or cargo without compromising safety or performance.

2. Extended Range

Another significant benefit of the Increased Gross Weight on the Boeing 737 is the extended range it offers. By carrying more fuel, the IGW variant allows for longer flights, enabling airlines to reach destinations that were previously out of range for the standard model. This enhanced range opens up new route possibilities and enables airlines to expand their operations, serving more markets and offering greater connectivity.

The Increased Gross Weight version of the Boeing 737 can fly up to 500 nautical miles farther than its standard counterpart, depending on the specific model and configuration. This additional range is achieved by increasing the aircraft’s fuel capacity, optimizing the wing design for efficient fuel consumption, and incorporating advanced engine technologies.

3. Improved Performance

With the Increased Gross Weight, the Boeing 737 experiences improved performance characteristics across various parameters. These performance enhancements include:

  • Shorter takeoff distance
  • Reduced landing distance
  • Improved climb rate
  • Increased cruise speed
  • Better fuel efficiency
  • Higher maximum altitude

All these improvements are achieved through meticulous design changes and the incorporation of advanced technologies. For example, the Increased Gross Weight variant may feature more powerful engines, optimized aerodynamics, and upgraded avionics systems. These enhancements contribute to a smoother and more efficient flight experience for both passengers and crew.


The Increased Gross Weight (IGW) variant of the Boeing 737 offers significant benefits to airlines in terms of enhanced payload, extended range, and improved performance. By increasing the aircraft’s weight limit, airlines can carry more passengers or cargo, maximizing their revenue potential. The extended range capabilities open up new route possibilities and allow airlines to serve more markets. With improved performance across various parameters, the Increased Gross Weight variant delivers a superior flying experience for both passengers and crew.

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