Nairobi's Jomo Kenyatta International sits at 5,327 feet above sea level. That elevation isn't trivia — it's a constraint that eliminates most substitution options before the conversation even starts. **Kenya Airways returned to financial losses in 2025. The cause wasn't demand. It was geometry.** The airline had clawed back to profitability in 2023–2024, not through restructuring magic but through genuine load factor recovery on routes to London, Amsterdam, Paris, Bangkok, and New York. Those routes share a common denominator: they're operated by Boeing 787-8s, and they only exist because the 787's ETOPS range and hot-and-high performance make them viable from a high-altitude African hub. When FAA and EASA airworthiness directives — tied to recurring fuselage join inspection requirements that have shadowed the Dreamliner since 2021 — grounded aircraft, Kenya Airways didn't lose some capacity. It lost the specific range capability its entire network topology depends on. **No 787 means no Nairobi-to-anywhere-that-pays.** Narrowbodies can't cover the sectors. Older widebodies struggle with the elevation penalties and burn economics that make thin African routes unworkable at scale. There is no drop-in replacement sitting on a lessor's availability list. This is what fleet concentration risk looks like in practice — not a spreadsheet warning in an annual report, but a single airworthiness directive that doesn't care about your hub strategy quietly erasing your long-haul P&L. For carriers operating at the margin of African aviation economics, fleet diversity was never a growth ambition. It's the only structural hedge against the moment one OEM's quality control problem becomes your network's existential event. The 787 is a remarkable aircraft. It's also, for Kenya Airways, the load-bearing wall of an entire business model — and load-bearing walls have no redundancy by design.