A CFO’s guide to aircraft engine cost optimisation

Aircraft engines are both the beating heart of airline operations and one of the largest drains on cash flows. Engine maintenance alone accounts for around five percent of an airline’s annual operating costs, and up to 60 percent of total maintenance spend. For an industry where margins are razor-thin and most easy efficiencies have already been captured, this represents a major untapped lever.

Our CFO’s guide to engine cost optimisation, summarized here, sets out how CFOs can step forward and seize their opportunity with a focus on three areas:

1. Harnessing predictive maintenance
2. Integrating full lifecycle economics
3. Optimising across the fleet.

From our experience of delivering engine cost optimisation programs, the financial significance of these steps cannot be overstated. Early adopters of new optimisation practices are reporting bottom-line savings of $400,000 per engine when considering all value across their engines’ lifecycles, rising to $1 million per engine when decisions are optimized on a fleet-wide basis. For a modest fleet of 50 narrow-body aircraft, cumulative cash savings can reach $100 million. These numbers underscore a simple truth: better measurement, planning, and coordination can transform engine maintenance from a cost burden into a source of enterprise value.

1. Harness predictive maintenance

Traditionally, engine maintenance planning has relied on conservative assumptions and fixed intervals. Predictive maintenance changes this dynamic. Sensors embedded in engines, combined with digital twin modelling, allow airlines to monitor condition and forecast maintenance needs. Instead of removing an engine after 4,500 cycles based on averages, real-time data might safely extend its life to 4,800 cycles. This approach reduces unnecessary shop visits, improves fleet utilisation, and delivers measurable financial benefits – all without compromising safety.

2. Integrate full lifecycle economics

Every choice relating to aircraft engines carries long-term financial consequences – both for leased aircraft approaching return conditions, and owned aircraft with aftermarket resale potential. Traditionally, this information has been scattered across contracts, departments, and internal experts, making it difficult to factor into planning.

By codifying and integrating this dispersed information, airlines can move away from ballpark estimates on future year budget requirements and also achieve financially optimized decisions while maximizing enterprise value for shareholders. For example, performing select maintenance before lease return may be cheaper than incurring penalties later. Similarly, investing in certain work scopes can preserve resale value and reduce future costs. These decisions require finance input to align operational planning with shareholder priorities. CFOs and their teams can deliver greater returns to shareholders by embedding themselves in this process, ensuring key financial variables are considered alongside engineering requirements.

3. Optimise across the fleet

The most advanced airlines are moving from engine-by-engine planning to fleet-wide optimisation – recognizing that engines are part of a complex network of operational and financial variables. Strategies include selectively swapping parts, prioritising engines for specific aircraft or routes, and even resting certain engines to maximize overall efficiency. These approaches, which were once impractical due to the sheer complexity involved, have been made feasible by advanced mathematical models and cloud computing.

Fleet-wide optimisation can prevent costly overlaps in shop visits, reduce penalties on leased engines, and unlock savings that were previously out of reach. For example, two engines might traditionally be removed and serviced simultaneously. A fleet-level model could suggest swapping a high-cost part between one engine and a spare, avoiding significant financial penalties. For CFOs, this is where the biggest gains lie: coordinating decisions across the fleet to maximize enterprise value.

The CFO’s role

Powerplant teams alone have little incentive to adopt these practices; their performance is judged on engine availability, not financial optimisation. Conservatism is natural.

CFOs must therefore lead the change – embedding financial acumen into planning, aligning incentives, and ensuring decisions reflect cash availability, cost of capital, and time value of money.

Lifecycle-based, fleet-wide thinking can and should become central to evaluating the countless number of options that powerplant teams have at their disposal, ensuring engine maintenance decisions are both operationally sound and financially optimized within the airline’s broader strategy.

To learn more, contact the Optima team to receive a copy or briefing of the full CFO’s guide to aircraft engine cost optimisation.