The global aviation MRO market is worth $97 billion in 2026. Airlines are spending more on maintenance than ever before. And yet aircraft are sitting on the ground waiting for maintenance slots that do not exist.

This is the paradox at the centre of aviation’s operational challenge: the money is there, but the capacity to spend it productively is not.

The numbers behind the crisis

Oliver Wyman’s 2026 Fleet & MRO Market Forecast projects the market growing from $91 billion in 2025 to $97 billion in 2026, with further growth towards $128 billion by the early 2030s. IATA forecasts 4.9% global passenger traffic growth in 2026, driving increased maintenance demand across every segment.

Engine overhauls remain the largest single category, accounting for approximately 47% of total MRO spend. This is also where the most severe capacity constraints exist.

The Pratt & Whitney GTF inspection campaigns — triggered by contaminated powder metal in turbine discs — have created a multi-year wave of unscheduled engine removals. Every GTF pulled for inspection is an engine shop visit that was not in the original maintenance plan, displacing scheduled work and extending turnaround times across the industry.

The technician shortage is structural, not cyclical

The global aircraft maintenance technician shortfall is projected to reach approximately 22,000 by the end of 2026. McKinsey’s analysis suggests this could nearly triple within three years.

This is not a temporary post-pandemic recovery issue. It is structural:

The existing workforce is ageing, with a significant cohort approaching retirement. Training pipelines produce fewer graduates than the industry needs. Certification takes years — there is no fast track to a licenced aircraft engineer. And MRO wages compete against other skilled trades that offer better working conditions and more predictable schedules.

Building a new maintenance bay takes years. Certifying a new facility takes years. Training a technician takes years. The structural mismatch between demand growth (driven by fleet expansion and ageing aircraft) and capacity growth (constrained by physical infrastructure and human capital) will not correct in 12-18 months. It may not fully correct this decade.

Where capacity exists, execution matters

One finding that challenges conventional thinking: some MRO providers are consistently delivering faster turnaround times and meeting schedules more reliably than peers, without having materially more technicians.

The difference is operational coordination. MROs that have invested in resource planning technology, predictive maintenance scheduling, and supply chain pre-positioning are extracting more throughput from the same labour force. The bottleneck is not always headcount — it is how effectively headcount is deployed.

This has implications for airlines selecting MRO partners. The relevant question is not “how many bays do you have?” but “what is your on-time release rate, and what is your first-run yield on engine shop visits?” Data-driven MRO selection can reduce aircraft-on-ground days by weeks per year.

The planning imperative

For airlines and lessors, MRO capacity is no longer an operational detail — it is a strategic risk. An airline that cannot secure maintenance slots sees aircraft grounded, schedules disrupted, and revenue lost. A lessor that cannot get a returned aircraft through a check faces months of non-revenue time.

MRO planning must now be integrated into fleet strategy, lease return management, and financial forecasting at the board level. Airlines that treat maintenance as a procurement function rather than a strategic function will find themselves at a competitive disadvantage.

Boston Warwick’s MRO advisory practice helps operators and investors navigate this environment — from shop visit forecasting and MRO provider evaluation to capacity planning and workforce strategy modelling.

The $97 billion question is not whether the market will grow. It is whether the industry can build the capacity to serve it.