KF Aerospace has achieved a global first with the certification of a Boeing 737-800 Combi aircraft, representing a significant step forward in commercial aircraft modification.
Transport Canada has approved the conversion through the issuance of a Supplemental Type Certificate (STC SA25-72), authorising the aircraft to enter operational service. The newly certified configuration combines a forward main-deck cargo compartment with five pallet positions and an aft passenger cabin seating up to 90 travellers.
This multi-role layout makes the aircraft the only Boeing 737-800 Combi currently certified worldwide, with no equivalent aircraft in service across the United States, Europe, or other international markets.
The first converted aircraft was completed and handed over to Canadian operator Air Inuit in October 2025, supporting the airline’s ongoing fleet modernisation programme.
The 737-800 Combi certification builds on the established performance of the AEI 737-800SF programme, including the large cargo door design, and marks another milestone in the long-standing collaboration between KF Aerospace and Aeronautical Engineers, Inc. (AEI).
Commenting on the achievement, Robert T. Convey, Senior Vice President at AEI, highlighted the strength of the partnership, noting that the programme reflects more than three decades of close cooperation between the two companies. He said that combining AEI’s cargo conversion expertise with KF’s engineering and operational capabilities enabled the delivery of a world-first Combi solution that opens new opportunities for operators globally.
The certification programme required extensive redesign of the aircraft’s interior and systems to meet stringent regulatory requirements. KF Aerospace developed and integrated new fire detection systems, halon-based fire suppression, and advanced smoke-containment solutions for the forward cargo area. Existing freighter detection systems were also adapted to comply with Combi-specific standards.
The project led to the development of hundreds of new components and bespoke engineering solutions, underlining the technical complexity of the conversion.
Gregg Evjen, President of KF Aerospace, said the programme showcased the depth of expertise across the company, from engineering to manufacturing, installation, and testing. He added that the successful certification demonstrates KF Aerospace’s ability to deliver innovative, first-of-its-kind aircraft conversion solutions tailored to demanding operational requirements.