The Jets Are Flying Again, But Engine Costs Keep Climbing

Global passenger traffic has surged back above pre pandemic levels and widebody aircraft are flying more hours than in 2019, but airlines and engine makers are discovering that the cost of keeping modern turbofans turning is climbing faster than the recovery itself.

Flying Hours Recover, Shop Visits Pile Up

Industry data indicates that long haul engine flying hours for major manufacturers have returned to, and in some cases exceeded, 2019 levels as international travel rebounds. Rolls Royce has reported large engine flying hours at around or above pre pandemic benchmarks, with further growth expected as more widebody aircraft rejoin airline fleets. This is restoring a crucial revenue stream from long term service agreements that pay per flight hour.

The rebound in utilization is now intersecting with a growing wave of scheduled overhauls that were deferred during the crisis years. Maintenance specialists note that airlines pushed shop visits as far to the right as safety rules allowed while aircraft were parked or flying reduced schedules. As those extensions expire, more engines are due for heavy work at the same time that new generation fleets are ramping up.

For Rolls Royce, publicly available financial information shows an increase in total shop visits alongside rising flying hours, reflecting what the company describes as a return to a more normal maintenance cycle. Similar dynamics are playing out across narrowbody fleets powered by CFM International and Pratt & Whitney engines, where utilization has snapped back but service capacity remains tight.

The result is a squeeze in which spare engine demand, hangar slots and specialist labor are all under pressure. Even where underlying reliability is improving, the sheer volume of work is pushing aggregate maintenance spending higher than many airline budgets anticipated when traffic first began to return.

New Technology, Old Problem: Durability In Service

Many of the engines driving today’s traffic recovery belong to a new generation of high bypass, high pressure ratio turbofans that promised double digit fuel burn savings. CFM’s LEAP family and Pratt & Whitney’s geared turbofan series were designed to cut operating costs and emissions for workhorse aircraft such as the Airbus A320neo and Boeing 737 Max.

In practice, the introduction of this advanced technology has brought teething issues that affect time on wing and maintenance planning. CFM and GE Aerospace have described a series of durability improvements for LEAP engines, including more robust high pressure turbine hardware and systems to mitigate dust and carbon buildup, particularly in hot and harsh environments. These upgrades aim to extend the interval between shop visits and reduce the need for early removals.

Rolls Royce has similarly outlined efforts to strengthen blade designs and refine component lifing on its Trent family, while targeting longer intervals between overhauls as part of a broader “time on wing” program. Technical documentation highlights new materials, revised cooling paths and contract renegotiations intended to align reliability with the heavy utilization patterns now returning on long haul routes.

Until these measures fully work through the fleet, however, airlines are living with more frequent inspections and component changes than they had expected from new engines. Each early removal or durability fix adds to near term maintenance bills, even if the longer term trend is toward greater stability and lower lifecycle cost.

Pratt & Whitney’s GTF Inspections Ripple Across Fleets

The most visible example of engine related disruption in the recovery phase has been the prolonged inspection campaign involving Pratt & Whitney’s geared turbofan series for the A320neo family. RTX filings and public statements describe a rare condition in the powder metal used to manufacture certain parts, prompting accelerated inspections and removals of hundreds of engines worldwide.

Pratt & Whitney has estimated direct financial impacts in the multibillion dollar range, including compensation to airline customers and the cost of additional shop visits. Disclosures indicate that the company expects an average of several hundred aircraft to remain grounded at various points through 2026 as affected engines cycle through inspection and repair. That burden has forced carriers to wet lease capacity, reshuffle networks and in some cases delay planned growth.

To cope, Pratt & Whitney is expanding its maintenance, repair and overhaul footprint, with investments at facilities such as its West Palm Beach engine center intended to raise geared turbofan capacity significantly by the mid 2020s. Publicly available information shows a strategy focused on adding test cells, tooling and specialized workforce to shorten turnaround times.

For airlines, the GTF issue illustrates how a technical problem inside a single engine program can add layers of cost far beyond the workshop invoice. Extra spare engines, schedule disruptions, higher fuel burn from operating older aircraft, and the opportunity cost of parked jets all combine to keep the effective engine bill rising even as flying resumes.

Capacity Constraints and Power-By-the-Hour Economics

Another driver of higher engine bills in the recovery is the limited capacity of the global maintenance ecosystem. Specialist MRO providers report strong demand for heavy engine work across both narrowbody and widebody fleets, at a time when experienced technicians are in short supply and supply chains for critical parts have not fully normalized.

This tightness gives engine manufacturers and independent shops greater pricing power for overhauls and repairs. Rates for life limited parts, labor and material have climbed, according to industry coverage, with some operators facing longer lead times for slots and spares. As a result, airlines may have to accept higher invoices simply to secure timely maintenance and keep aircraft available for the busy travel seasons.

The structure of long term service agreements amplifies these trends. Under power by the hour models, manufacturers such as Rolls Royce historically accepted low or negative margins on original equipment sales with the expectation of profitable aftermarket revenue once engines entered service. With flying hours now back and shop visits rising, those revenue streams are strengthening, and manufacturers are adjusting pricing and contract terms to reflect higher input costs.

Public filings suggest that engine makers are seeking improved margins on renewals, introducing value based pricing and, in some cases, reducing the scope of risk they absorb. For airlines locked into long term agreements, this can translate into higher per hour charges at the very moment they are trying to rebuild balance sheets and invest in fleet growth.

What It Means for Airfares and Fleet Decisions

The combination of technical fixes, compressed maintenance cycles and constrained MRO capacity means that engine costs are likely to remain elevated for several years, even as reliability improves. Analysts note that this is one reason why many carriers are retaining older but fully depreciated aircraft longer than planned, using proven engine types to cover schedules while newer fleets cycle through upgrades.

At the same time, airlines are factoring maintenance experience into future fleet and engine selections. Reports indicate that some operators have diversified away from engine types facing extended inspection campaigns, while others are negotiating harder on support terms, spare engine pools and performance guarantees before confirming large orders.

For travelers, the effect is indirect but real. Higher engine maintenance outlays feed into overall unit costs for airlines alongside fuel, labor and airport charges. In competitive markets, some of those increases may be absorbed through efficiency gains, but in constrained capacity environments they can put upward pressure on fares, particularly on routes dominated by a few carriers or aircraft types.

As the industry moves deeper into the post pandemic era, the story of the recovery is no longer just about whether jets are flying, but about how sustainably they can be kept in the air. Modern engines are delivering significant fuel savings and emissions reductions, yet the bills arriving in airline finance departments show that achieving those gains comes with a complex, and often rising, maintenance price tag.