Engine spending is projected to claim a 53% share of 2026's total commercial aftermarket revenue of $139 billion, according to Aviation Week's latest forecast. That share stood at 49% in 2025 and 46% in 2024.

Overall annual MRO spending has risen 40% since 2019 while supporting 10% more global capacity, AeroDynamic Advisory calculates. North America carries an outsized portion of the engine total. Aviation Week data puts regional engine maintenance demand at $159 billion for the 2026 to 2035 period, close to a fifth of the $848 billion world total.

Cost pressure is measurable. An Oliver Wyman analysis prepared for IATA found airlines paid about $3.1 billion in additional maintenance costs tied to supply chain constraints in 2025. Carriers spent another $1.4 billion on excess inventory to cover parts availability risk, plus an estimated $2.6 billion on excess engine leases to keep airframes flying.

The quarterly MRO survey from RBC Capital Markets projects total MRO sales to rise 10.9% across 2026, led by an 11.7% jump in engine work and an 11.6% increase in component work. Respondents expect an 8.5% increase in total MRO sales through the end of June. More than 50% of the 40-plus respondents ranked spare parts availability and the pace of new aircraft deliveries among the top three factors influencing first-half growth.

IATA figures project revenue passenger kilometers climbing 4.9% in 2026 against 5.2% in 2025, with available seat kilometers up 4.7% year over year.

Source: Aviation Week Network - https://aviationweek.com/mro/supply-chain/early-2026-outlook-shows-mro-market-momentum-increasing