KF Aerospace is proud to announce the successful certification of the world’s first Boeing 737-800 Combi conversion, marking a major advancement in global aircraft modification capability. Transport Canada has officially approved the modification with the issuance of a Supplemental Type Certificate (STC #SA25-72), clearing the way for the aircraft to enter service.
The newly certified 737-800 Combi integrates a unique multi-role configuration, featuring a forward cargo compartment with five pallet positions and a 90-passenger cabin in the aft section. This innovative layout makes it the first B737-800 aircraft of its kind anywhere in the world, with no comparable Combi currently in operation in the U.S., 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.
The 737-800 Combi STC further expands the aircraft’s versatility, building on the proven utility and reliability of the AEI 737-800SF large cargo door. Its certification marks another milestone in the successful collaboration between KF and AEI.
“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,” says Robert T. Convey, Senior Vice President at AEI. “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.”
Completion of the program required a substantial redesign of the aircraft’s 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 program possible.
The project is a testament to the advanced capabilities of KF’s in-house engineering department. KF’s manufacturing, installation, and test teams also played critical roles throughout the conversion.
“This project reflects the ingenuity, dedication, and deep technical expertise of our entire team,” says Gregg Evjen, President of KF Aerospace. “KF is proud to deliver a world-first solution that expands what’s possible in aircraft conversion and supports our customers’ complex operational needs.”
The newly certified 737-800 Combi directly meets the customer’s requirement for a large-capacity mixed-use aircraft, seamlessly accommodating both cargo and passengers. More broadly, the project underscores 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, demonstrating the company’s ongoing commitment to delivering industry-defining solutions through close collaboration between engineering, certification, production teams, and key partners.
