What is EXTN on Airbus A320? (Extension)

The Airbus A320 is a popular aircraft used by many airlines around the world. It is known for its efficiency, reliability, and advanced technology. One of the key features of the Airbus A320 is its ability to be extended or modified to suit the specific needs of an airline. This extension, often referred to as “EXTN,” is a term that aviation enthusiasts and professionals are familiar with.

Understanding Extension on Airbus A320

The extension on the Airbus A320 refers to the process of modifying the aircraft to incorporate additional features, capabilities, or improvements. These modifications can be made to various aspects of the aircraft, such as its structure, systems, or avionics. Extensions are typically performed by Airbus or approved modification centers, ensuring that the modifications meet stringent safety and regulatory requirements.

Extensions on the Airbus A320 can be classified into different categories based on the specific area of modification. Let’s explore some of the common extensions that are available for the A320 aircraft:

1. Cabin Extension

The cabin extension involves modifying the interior of the aircraft to accommodate more passengers or enhance passenger comfort. Airlines can choose to add extra rows of seats, reconfigure the seating layout, or introduce premium cabin features like lie-flat seats or private suites. These modifications are aimed at maximizing revenue generation by increasing the seating capacity or attracting high-end customers.

For example, British Airways introduced a cabin extension on their Airbus A320neo aircraft, allowing them to increase the seating capacity from 168 to 180 passengers. This extension involved rearranging the seats and optimizing the cabin space to accommodate the additional passengers without compromising on comfort or safety.

It is important to note that cabin extensions must adhere to strict safety regulations, including maintaining appropriate evacuation capabilities, providing sufficient oxygen supply, and ensuring the durability of the modified cabin structure. These modifications are thoroughly tested and approved by aviation authorities to guarantee the safety of passengers and crew.

2. Wingtip Extension

The wingtip extension, also known as winglet installation, is a popular modification that improves fuel efficiency and overall performance. The wingtips of an aircraft produce vortices, which result in drag and reduce the aircraft’s overall efficiency. By extending the wingtips, these vortices are minimized, leading to reduced fuel consumption, increased range, and improved takeoff and landing performance.

A popular wingtip extension option for the Airbus A320 is the installation of Sharklets. Sharklets are upturned wingtips that are designed to reduce drag and increase lift. They are approximately 2.4 meters tall and are made from lightweight composites. The installation of Sharklets on the A320 results in fuel savings of up to 4%, contributing to lower operating costs and reduced environmental impact.

As of 2021, more than 70% of Airbus A320 aircraft have been delivered with Sharklets, highlighting the effectiveness and popularity of this wingtip extension. Airlines have recognized the long-term benefits of reduced fuel consumption and have prioritized the installation of Sharklets across their A320 fleets.

3. Avionics Extension

The avionics extension involves upgrading or adding new electronic systems and equipment to improve the aircraft’s navigational, communication, and monitoring capabilities. This extension ensures that the A320 remains compliant with the latest industry standards and regulations, as well as enhances operational efficiency and safety.

An example of an avionics extension on the Airbus A320 is the installation of the ADS-B (Automatic Dependent Surveillance-Broadcast) system. ADS-B allows the aircraft to transmit its position, altitude, and other data to air traffic control and other equipped aircraft. This technology significantly improves situational awareness, reduces the risk of mid-air collisions, and enhances air traffic management.

The ADS-B system is becoming a mandatory requirement in many regions, including the United States and Europe. Airbus offers the ADS-B Out solution as a retrofittable extension for the A320, ensuring that operators can comply with the regulatory requirements and benefit from the enhanced safety and efficiency features of ADS-B.


The extension on the Airbus A320 plays a crucial role in maximizing the capabilities and efficiency of the aircraft. From cabin modifications to wingtip enhancements and avionics upgrades, extensions allow airlines to customize the A320 to their specific requirements and stay up-to-date with the latest technological advancements.

Extensions on the A320 are carefully regulated, tested, and approved to ensure the safety of passengers and crew. These modifications not only improve the aircraft’s performance but also contribute to fuel savings, increased revenue, and reduced environmental impact. As the aviation industry evolves, extensions will continue to play a vital part in enhancing the efficiency and versatility of the Airbus A320.

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