Aircraft Development Archives - Leeham News and Analysis

Leeham News and Analysis has been publishing a sustained, technically rigorous multi-part series under the "Bjorn's Corner" banner that dissects the full lifecycle of large commercial airliner development, with a focus on compressing the historically lengthy timelines that have defined programs like the Boeing 787 and Airbus A350. The series, authored by aerospace engineer Bjorn Fehrm, spans more than 26 installments and walks through every major development gate — from Interior Preliminary Design and Requirements Definition through Preliminary Design Review, Critical Design Review, prototype fabrication, and full certification implementation — before addressing the often-overlooked sustainment phase that follows Entry Into Service. The latest installment, published in February 2026, tackles artificial intelligence as an accelerant across multiple phases of the development process, while a newly launched companion series on airliner structures begins examining the structural design challenges associated with unconventional configurations, with Blended Wing Body airliners serving as the primary case study.

The series speaks directly to a structural problem that has repeatedly undermined the business cases of new commercial aircraft programs: development timelines that routinely stretch to a decade or more, with cost overruns that can threaten manufacturer solvency. Boeing's 787 program, which ran years late and billions over budget due in part to supply chain integration failures and composite manufacturing challenges, and Airbus's A380, which suffered from wiring harness design fragmentation across national engineering teams, stand as canonical cautionary examples. Fehrm's framework proposes not revolutionary technology alone but disciplined process reform — tighter design freezes, earlier and more rigorous design reviews, and better-managed transitions between development phases — as the primary levers for schedule compression. The inclusion of a full installment on the post-certification sustainment phase is notable, as it acknowledges that a faster path to type certificate is commercially meaningless if the production system, supply chain, and maintenance documentation infrastructure are not simultaneously mature.

The AI installment (Part 26) arrives at a moment when aerospace OEMs and their Tier 1 suppliers are actively piloting generative and analytical AI tools across engineering workflows. Applications being explored industry-wide include AI-assisted stress analysis, automated compliance tracing against FAA Part 25 and EASA CS-25 airworthiness standards, model-based systems engineering with machine learning optimization loops, and AI-driven configuration management to reduce the engineering change order proliferation that has historically consumed enormous schedule margin on complex programs. For working airline pilots and corporate flight departments, these developments matter because accelerated and more disciplined development timelines translate directly into the speed at which next-generation aircraft — with meaningfully better fuel burn, range, and operating economics — reach fleet availability and competitive pricing.

The transition from the faster-development series into the new airliner structures series signals that Leeham's editorial focus is now turning toward the physical and regulatory complexity of non-tube-and-wing configurations, with BWB representing the most ambitious and structurally demanding candidate for the next generation of high-capacity commercial transport. BWB airframes present certification challenges that existing FAR/CS Part 25 frameworks were not written to address — pressure vessel geometry, emergency evacuation geometry, and novel load path distributions among them — meaning that structural design is inseparable from the regulatory innovation question. For operators evaluating long-range fleet planning horizons extending into the 2035–2045 window, understanding the structural and certification barriers facing BWB programs provides essential context for assessing how seriously to weight manufacturer roadmap claims about unconventional platforms entering commercial service at scale.