Airlines are restructuring growth and fleet strategies as a deepening aerospace supply chain crisis limits access to new aircraft and critical parts. Industry data from IATA and consulting firm Oliver Wyman indicate that delivery shortfalls have reached at least 5,300 aircraft, with a global order backlog exceeding 17,000 jets. At current output, that represents roughly 12 to 14 years of production, and major aircraft families are effectively sold out well into the next decade.
The squeeze is driving airlines to keep older, less fuel-efficient aircraft in service longer, delaying planned fleet renewals. This shift is eroding expected fuel savings and pushing up maintenance and repair costs, particularly as engine issues keep more powerplants on the ground and extend overhaul times. Engine leasing and aircraft lease rates have risen sharply, while airlines are stockpiling spares, adding an estimated $1.4 billion to inventory costs. IATA and Oliver Wyman estimate that supply chain disruptions will cost carriers more than $11 billion in 2025 alone.
Underlying causes include a highly concentrated supplier base, post-pandemic labor shortages, raw material constraints, and geopolitical tensions that have disrupted metals and electronics flows. Certification delays for new models and the industry’s reliance on OEM-controlled aftermarket business models further constrain capacity. As a result, airlines are shifting from aggressive network expansion to selective, yield-focused growth, prioritizing profitable routes over broad capacity increases. Many are also deepening long-term partnerships with OEMs, MRO providers, and lessors, and exploring alternative parts, used serviceable materials, and predictive maintenance to build resilience into a fragile aviation supply chain.