KF Aerospace has announced the successful certification of the world’s first
Boeing 737-800 Combi conversion, marking a significant advancement in global aircraft modification capability. Transport Canada has officially approved the modification with the issuance of Supplemental Type Certificate (STC #SA25-72), clearing the way for the aircraft to enter service.
The newly certified 737-800 Combi features a unique multi-role configuration, combining a forward cargo compartment with five pallet positions and a 90-passenger cabin in the aft section. This innovative layout makes it the first aircraft of its kind anywhere in the world, with no comparable Combi currently in operation in the US, Europe, or other international markets. The first aircraft was completed and delivered to
Air Inuit in October 2025 as part of the airline’s fleet modernisation programme.
The certification builds on the proven utility of the AEI 737-800SF large cargo door and represents another milestone in the long-standing collaboration between KF Aerospace and
Aeronautical Engineers Inc (AEI). Robert T. Convey, senior vice president at AEI, said: “The achievement of the 737-800 Combi underscores the power of a true partnership that KF and AEI have enjoyed over the course of three decades. By combining AEI’s cargo door conversion expertise with KF’s engineering and operational strengths, we are able to deliver a world-first Combi that unlocks new possibilities for operators worldwide.”
Stringent certification requirementsKF Aerospace’s engineering team played a key role in the project, designing and implementing extensive structural modifications across the aircraft. Completion of the programme required a substantial redesign of the interior and systems to meet stringent certification requirements. KF Aerospace engineered and integrated fire detection, halon-based fire suppression, and advanced smoke-containment systems for the forward cargo section, while also modifying existing freighter-specific detection systems to meet Combi-specific criteria. The effort resulted in the creation of hundreds of new parts and custom-engineered solutions to make this technically complex modification possible.
Gregg Evjen, president of KF Aerospace, commented: “This project reflects the ingenuity, dedication, and deep technical expertise of our entire team. KF is proud to deliver a world-first solution that expands what is possible in aircraft conversion and supports our customers’ complex operational needs.”
The newly certified 737-800 Combi meets the customer’s requirement for a large-capacity mixed-use aircraft, seamlessly accommodating both cargo and passengers. More broadly, the project demonstrates KF Aerospace’s ability to overcome the regulatory and engineering challenges that have historically limited Combi aircraft development worldwide. This milestone highlights KF Aerospace’s leadership in innovative conversions, advanced engineering, and custom STC development, reinforcing the company’s commitment to delivering industry-defining solutions through close collaboration between engineering, certification, production teams, and key partners.