Editor’s note: When LNA is asked about the progress of Boeing’s recovery, we always express a caveat before answering: It depends on events outside Boeing’s control. The Iran war is just such an event.
March 17, 2026, © Leeham News: The paradox at the heart of modern commercial aviation is that the materials engineered to insulate airlines from oil price volatility are themselves creatures of the petrochemical complex.
Boeing’s 777X and 787 programs, with their heavy use of composites, face high risks of disruptions and costs due to the Iran War. Source: Boeing.
Carbon fiber composites reduce fuel burn by 20% over legacy aluminum airframes. Yet the polyacrylonitrile precursor fiber, the epoxy matrix resins, the autoclave energy—the entire manufacturing stack—runs on oil. When the Strait of Hormuz effectively closed on Feb. 28, it did not merely threaten jet fuel supply chains. It aimed directly at the raw material foundation of Boeing’s two most consequential programs: the 787 Dreamliner and the 777X.
Airbus faces similar challenges for the A350. A major Boeing composites supplier, Toray Industries, is used in secondary structures, and the impact is far smaller. US-based Hexcel is a major composites supplier to Airbus through its European operations.
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