An aircraft engine is sold once.

The relationship can last for decades.

Through CFM International, its 50/50 joint venture with GE Aerospace, Safran has helped build two of the most important commercial engine families in aviation: the CFM56 and its successor, the LEAP.

The CFM56 already has an installed base of roughly 29,900 engines.

More than 22,800 of the second-generation CFM56-5B and -7B engines were still in service at the end of 2025.

The LEAP is replacing that fleet.

Nearly 11,000 LEAP engines had been delivered by the end of 2025, with another 12,900-plus engines in backlog.

Every delivery expands the future aftermarket.

Safran can lose money or earn very little on an original engine sale and still create a valuable economic relationship if that engine stays in service for twenty or thirty years.

The installed base compounds first.

The cash flow follows later.

Commercial aircraft engines are not ordinary manufactured products.

They require inspections, spare parts, repairs, overhauls, software, engineering support, and repeated shop visits throughout their life.

The more engines in service, the larger the future pool of maintenance demand.

Safran benefits in several ways.

It sells spare parts.

It performs maintenance.

It earns through long-term service contracts.

It supplies material to third-party repair shops.

It can improve the economics of a program as the fleet matures and the aftermarket grows.

That makes engine economics look strange early in a program.

Manufacturers often price new engines aggressively because winning the original position on the aircraft creates decades of future revenue.

The installed base becomes the asset.

This is why I care more about fleet size, utilization, durability, shop visits, and service agreements than the margin on one new engine delivery.

The CFM56 is one of the most successful commercial engines ever built.

It powers older generations of the Airbus A320 family and Boeing 737.

Safran says the CFM56 still powers more than half of flights in the narrowbody segment.

The fleet is aging, but not disappearing quickly.

That matters because aging engines generally require more maintenance.

The second-generation CFM56 fleet is also relatively young for a mature engine program.

Safran expects it to continue producing strong aftermarket revenue through the end of the decade.

The third quarter showed that the aftermarket remains strong, even as growth normalized from the first half.

Propulsion revenue grew 13.2% organically in the quarter.

Aftermarket revenue increased 18.7%, while original-equipment revenue increased 3.5%.

Civil-engine spare-parts sales increased 17% in U.S. dollars, driven by CFM56 pricing, better parts availability, and growing LEAP activity.

Services revenue increased 19%, mainly from LEAP flight-hour contracts.

The latest profitability figures remain the first-half results: propulsion operating profit increased 28% to €2.25 billion, with a 24.5% margin.

Safran is still monetizing the mature CFM56 fleet while building the LEAP fleet that should replace it.

The old installed base has not stopped earning.

The new installed base is getting larger every year.

The LEAP powers three major aircraft families.

The LEAP-1A competes on the Airbus A320neo family.

The LEAP-1B is the sole-source engine on the Boeing 737 MAX.

The LEAP-1C is used on the COMAC C919.

Safran delivered 1,802 LEAP engines in 2025, up 28%.

Safran delivered 535 LEAP engines in the third quarter, up 5% from a year earlier and 5% sequentially.

Management kept its full-year expectation for LEAP deliveries to grow in the high teens.

The production ramp is continuing, even as the aftermarket becomes a larger part of the earnings story.

More aircraft deliveries mean more engines in service.

More engines in service mean more flight hours.

More flight hours eventually mean more shop visits.

More shop visits mean more spare parts and service revenue.

The timing matters.

A new engine does not need heavy maintenance immediately.

The real economics arrive later.

Safran is laying down the installed base now for aftermarket revenue that can persist well into the 2040s.

The biggest question is not whether CFM56 aftermarket revenue eventually declines, because it will.

The question is whether LEAP aftermarket revenue grows fast enough to replace it.

Safran has been preparing investors for that handoff for years.

The company now expects a smoother transition than it did several years ago.

CFM56 demand has remained stronger for longer.

Aircraft retirements have stayed low.

Air traffic has recovered.

Airlines have kept older aircraft flying because new aircraft supply remains constrained.

At the same time, LEAP services are starting to contribute more meaningfully.

In 2025, Safran began recognizing profit on certain LEAP flight-hour service contracts.

LEAP spare-parts sales to third-party repair shops also increased.

By the first half of 2026, management was already pointing to higher LEAP service activity alongside the CFM56 strength.

This transition is what I would watch most closely.

If CFM56 declines faster than LEAP aftermarket grows, propulsion earnings can stall.

If the handoff stays smooth, Safran can move from one large installed base into another without a major earnings gap.

Safran does not monetize every LEAP engine the same way.

Some customers buy maintenance as needed.

Others sign long-term contracts priced around flight hours.

Under those contracts, Safran receives revenue as the engine flies and takes responsibility for future maintenance obligations.

Early in the life of the fleet, cash can arrive before the largest maintenance costs.

Accounting has to reserve for the work that will come later.

As the program matures and Safran gets better data on durability and maintenance costs, the economics become clearer.

That makes LEAP service profitability one of the most important variables in the company.

A small change in expected maintenance cost across thousands of engines can matter.

So can durability improvements.

Safran and CFM have been working on upgrades designed to increase LEAP time on wing, particularly in hot and harsh environments.

The new LEAP-1B durability kit is designed to roughly double time on wing in those conditions.

That is good for airlines because it reduces disruption and maintenance burden.

It can also improve the economics of Safran’s service contracts if actual maintenance costs come in below what was originally assumed.

Durability is therefore both a customer issue and a margin issue.

One concern with aircraft engines is that independent repair shops can compete for maintenance work.

CFM deliberately supports an open maintenance ecosystem.

That may sound like giving away aftermarket economics.

Third-party shops can perform maintenance.

They still need approved material, parts, technical data, and support.

Safran can make money supplying that ecosystem even when it does not perform the shop visit itself.

That creates two ways to participate.

Safran can earn from its own maintenance capacity.

It can also sell parts and material into third-party maintenance.

The Ryanair agreement announced in 2026 is a good example.

Ryanair plans to develop its own engine repair shops.

CFM still expects to provide long-term material support across a fleet of roughly 2,000 CFM56 and LEAP engines.

The customer can own more of the maintenance work.

Safran can still own much of the proprietary content.

A large installed base is only valuable if Safran can support it.

LEAP shop visits are beginning to ramp.

The company is spending heavily to increase maintenance capacity.

Safran plans to invest roughly €1 billion to reach capacity of about 1,200 LEAP shop visits per year by 2028.

It opened a major new facility in Hyderabad that should eventually handle 300 visits annually.

A new Casablanca facility is expected to add another 150.

The company is also increasing original-equipment production capacity, including a new LEAP assembly line in Morocco.

The engines are already being delivered.

The future maintenance demand is being created every day the aircraft fly.

The main risk is execution.

If maintenance capacity lags the fleet, airlines suffer and Safran can lose revenue.

If Safran expands too aggressively, returns on the new capacity can disappoint.

The installed base gives management unusually good visibility into the demand it is building for.

Propulsion is the part of Safran I find most attractive.

It is not the entire company.

Equipment & Defense generated €6.9 billion of first-half revenue and €907 million of recurring operating income.

The segment makes landing gear, wheels and brakes, nacelles, electrical systems, avionics, defense electronics, and other aircraft equipment.

Its operating margin reached 13.1% in the first half.

Many of those products have their own aftermarket.

Carbon brakes wear out.

Landing gear needs service.

Nacelles need maintenance.

Aircraft systems remain installed for years.

That gives Safran another installed-base dynamic outside engines.

Defense spending adds a separate growth driver.

Aircraft Interiors is much weaker economically.

The segment generated only a 3.7% first-half operating margin.

Profitability has improved, but it is still far below propulsion.

I would not give every euro of Safran revenue the same valuation.

The propulsion franchise earns the premium.

Third-quarter adjusted revenue increased 14.7% to €9.00 billion.

Revenue for the first nine months reached €26.57 billion, up 17.5%.

Propulsion remained the main growth engine, with third-quarter organic revenue up 13.2% and aftermarket activity up 18.7%.

The latest full profit figures are still from the first half: revenue increased 19% to €17.57 billion, recurring operating income increased 29% to €3.24 billion, and free cash flow was €2.62 billion.

Safran confirmed its full-year outlook: mid-teens revenue growth, €6.4-€6.5 billion of recurring operating income, and €4.7-€4.9 billion of free cash flow.

The company also continues to expect spare-parts and services revenue to grow in the mid-twenties for the full year.

The propulsion segment is doing most of the heavy lifting.

Its 24.5% first-half margin is unusually high for an industrial business.

The company also ended June with €1.67 billion of net cash.

That gives Safran room to invest in production and maintenance capacity while continuing to return capital.

Safran has increased dividends and buybacks.

The 2025 dividend was €3.35 per share.

Management has also committed to substantial share repurchases.

As of October 20, Safran had repurchased roughly four million shares for cancellation during 2026, equal to about 1% of the share capital, for €1.25 billion.

Its earlier capital-markets plan targeted returning roughly 70% of free cash flow through dividends and buybacks over 2024-2028.

The balance sheet can support that.

I would still judge buybacks by price.

Repurchasing shares is attractive when the market undervalues the long-duration aftermarket.

It is less compelling when investors already price in a near-perfect LEAP transition.

Safran also has a history of acquisitions.

The company has been pruning weaker businesses while adding selected aerospace assets.

I prefer that discipline to buying growth for the sake of size.

The installed base already gives Safran enough organic growth opportunities.

Management does not need a large acquisition to make the story work.

The LEAP can compound for decades.

Safran still has to prepare for what comes after it.

Through the RISE technology program with GE Aerospace, CFM is developing technologies for the next generation of narrowbody engines.

That work includes open-fan architecture, lighter materials, hybrid-electric systems, and other efficiency improvements.

This spending reduces current earnings.

It is necessary.

Engine franchises last because manufacturers keep winning the next platform.

The worst long-term outcome would be harvesting the CFM56 and LEAP installed bases while losing the next generation.

Safran spends heavily on research because the next engine win determines the installed base twenty years from now.

I view that spending differently from ordinary corporate overhead.

It is the cost of renewing the moat.

Demand is not the problem.

Airbus and Boeing both want more engines.

Airlines want more aircraft.

Safran has a large LEAP backlog.

The constraint is producing enough hardware with the required quality.

Engine manufacturing depends on complex castings, forgings, electronics, specialized materials, and suppliers that cannot increase capacity overnight.

Safran has repeatedly identified supply-chain capability as one of its main risks.

A company with enormous demand can still miss financial expectations because a supplier cannot deliver a relatively small component.

The same issue can constrain maintenance.

Shop visits require parts.

An engine waiting for material is not earning for the airline.

Supply execution is therefore one of the most important things I would monitor quarter to quarter.

Safran closed October 26 at €274.40 per share.

Using roughly €4.8 billion of 2026 free cash flow, the stock trades at about 24 times current-year free cash flow.

Using roughly €11.50 of free cash flow per share:

At 7% annual growth and a 22× ending multiple, the implied value is about €355, or a 5.3% annual price return.

At 10% growth and a 24× multiple, the implied value is about €444, or a 10.1% annual price return.

At 13% growth and a 26× multiple, the implied value is about €551, or a 15.0% annual price return.

The selloff materially improved the return math. Around €274, Safran is now near the range where I previously wanted more exposure, although I would still prefer additional margin of safety.

The biggest risks I am watching are:

The LEAP aftermarket disappoints. Lower maintenance intensity, weaker pricing, or service-contract economics could make the new installed base less valuable than expected.

CFM56 declines faster than LEAP grows. The handoff between the two programs is the central earnings risk.

Durability problems raise service costs. Safran can owe maintenance under long-term contracts even when the economics of the contract were priced years earlier.

Supply-chain problems constrain deliveries or repairs. Demand does not matter if Safran cannot build engines or secure parts.

Boeing or Airbus production slows. LEAP deliveries depend heavily on narrowbody production.

Air traffic falls. Fewer flight hours reduce wear, maintenance demand, and service revenue.

The next engine loses share. The current installed base is valuable, but aerospace franchises must eventually renew themselves.

Research and capital spending rise faster than cash flow. Safran is investing heavily in maintenance capacity, production, defense, and next-generation technology.

The valuation stays too high. An excellent company can still be a mediocre investment when the starting multiple leaves no room for disappointment.

I would become more cautious if CFM56 aftermarket revenue weakened materially before LEAP services were large enough to replace it.

I would watch LEAP shop-visit growth, spare-parts sales, and service profitability more closely than new-engine deliveries alone.

I would also watch durability.

Longer time on wing helps customers and can improve contract economics.

Unexpected maintenance requirements do the opposite.

Propulsion margins matter.

If the installed base keeps growing but propulsion margins begin falling for structural reasons, I would want to understand why.

And I would watch the next-generation engine program.

The current fleet can support Safran for a long time.

The company still has to win again.

Safran is selling engines today that can create aftermarket revenue for decades.

That is what makes the business different from a normal manufacturer.

The CFM56 installed base is still producing strong spare-parts and service revenue.

The LEAP installed base is growing quickly behind it.

Nearly 11,000 LEAP engines had already been delivered by the end of 2025.

More than 12,900 were still in backlog.

Every new delivery adds another engine that can eventually need parts, maintenance, and service.

The economics become more attractive as that base ages.

That is the compounding mechanism.

The first-half profit figures showed the operating leverage: 19% revenue growth, 29% operating-profit growth, a 24.5% propulsion margin, and €2.6 billion of free cash flow.

The third quarter added another €9.0 billion of revenue, 18.7% organic aftermarket growth in Propulsion, and 535 LEAP deliveries.

The company is still executing well.

The selloff has improved the starting valuation.

At roughly 24 times current-year free cash flow, the return math is much more reasonable than it was before the third-quarter selloff.

I like the installed base.

At this price, I am spending more time on the stock.

Disclosure: I own shares of Safran as of the date of publication. This research reflects my personal views and is not investment advice.