What is SUP-NUM on Boeing 737? (Supernumerary)

The Boeing 737 is one of the most popular commercial aircraft around the world. It has been in service for several decades and has undergone numerous upgrades to improve performance and passenger comfort. One interesting feature of the Boeing 737 is the inclusion of supernumerary positions, also known as SUP-NUM. In this article, we will delve into what exactly supernumerary positions are on the Boeing 737 and how they contribute to the overall functionality of the aircraft.

Understanding Supernumerary Positions (SUP-NUM)

Supernumerary positions, abbreviated as SUP-NUM, refer to additional crew seats or spaces on an aircraft that are not part of the regular flight crew. These positions are typically occupied by individuals who have specific roles or responsibilities during the flight, such as cabin crew members, flight attendants, or even passengers with special needs.

The Boeing 737 is designed to accommodate multiple supernumerary positions to ensure the smooth operation of various functions on board. Let’s explore some common supernumerary positions found on the Boeing 737:

  • Cabin Crew Seats: The cabin crew plays a vital role in ensuring passenger safety and comfort. On the Boeing 737, supernumerary positions are specifically designated for cabin crew members to allow them to perform their duties effectively. These seats are strategically placed near exits or other crucial areas to enable quick response in case of emergencies.
  • Jump Seats: Jump seats are collapsible seats installed in the flight deck or cabin area. They are primarily used by supernumerary crew members, such as training instructors or pilots undergoing familiarization training. These seats provide an additional seating option without compromising the overall space and layout of the aircraft.
  • Maintenance Spaces: The Boeing 737 also includes designated spaces for maintenance and repair personnel. These spaces allow the technicians and engineers to conduct inspections, perform maintenance tasks, and troubleshoot any issues during flights or while the aircraft is on the ground.

The inclusion of supernumerary positions on the Boeing 737 highlights the importance of having dedicated spaces for individuals who contribute to the safe and efficient operation of the aircraft. By designating specific areas for cabin crew, training personnel, and maintenance staff, the Boeing 737 ensures the seamless execution of all necessary tasks during a flight.

Supernumerary Positions and Passenger Comfort

While supernumerary positions primarily cater to the needs of crew members and maintenance personnel, they can also impact passenger comfort. The strategic placement of cabin crew seats near exits and other important areas ensures that the crew members can quickly attend to any emergency situations, providing a sense of security and reassurance for passengers.

Additionally, the presence of supernumerary positions such as jump seats allows for more efficient crew transitions during flight. When there is a change in the flight crew, additional crew members can easily occupy the available jump seats, avoiding any disruptions or delays in service. This fluidity in crew movement contributes to a smooth and enjoyable flying experience for passengers.

Furthermore, the inclusion of maintenance spaces on the Boeing 737 ensures that any technical issues or repairs can be promptly addressed without inconveniencing the passengers. The availability of dedicated spaces for maintenance personnel allows them to efficiently carry out their tasks, reducing the risk of flight delays or cancellations due to unresolved maintenance concerns.


The supernumerary positions, or SUP-NUM, on the Boeing 737 serve a crucial role in enhancing the functionality and efficiency of the aircraft. These positions accommodate cabin crew members, training personnel, and maintenance staff, ensuring that they have designated spaces to perform their duties effectively. The inclusion of supernumerary positions not only contributes to the overall safety and smooth operation of the aircraft, but also enhances passenger comfort during flights.

Next time you board a Boeing 737, take a moment to appreciate the thoughtfulness behind the inclusion of supernumerary positions. These seats and spaces represent the careful consideration given to the diverse needs of both crew members and passengers, ultimately creating a better flying experience for everyone.

For More: What is RVT on Boeing 737? (Rotational Variable Transformer)