Aerospace
The commercial aerospace supply chain is relocating, and not by choice. Western tier-one capacity is constrained by an ageing skilled workforce and wage inflation, while the replacement cycle for a global fleet averaging around fifteen years keeps demand firm. India currently captures a small fraction of a roughly $150bn addressable component and labour market.
Complexity sets pricing power, not volume. What a supplier machines, on how many axes, and whether the part rotates matters more to margin than how much of it ships.
A supply chain under structural pressure.
Demand is unusually visible. Passenger load factors have run near 86%, and the global fleet has aged to roughly fifteen years against about eleven pre-pandemic. Deferred replacement plus firm traffic gives the airframers order books measured in years rather than quarters — which is what makes supplier revenue in this sector so much more predictable than in most industrials.
Supply is the constraint. The traditional Western base, still around 70–75% of the industry, is squeezed on three fronts at once: a median machinist age near fifty, sharp wage inflation in the established aerospace clusters, and higher industrial power costs in Europe. Capacity is not keeping pace with the rate airframers want to build at.
The redirection is deliberate. Western OEMs are diversifying sourcing for strategic as well as cost reasons. Indian suppliers — many of which built their machining and quality systems servicing defence offset obligations — are among the beneficiaries, though the base is small.
The complexity hierarchy
Not all aerospace revenue is equal. Position on this ladder, more than scale, determines the margin a supplier earns.
- MaterialTitanium and superalloys retain heat and destroy tooling, so few shops can machine them economically. Steel and aluminium are far more contested.
- MachiningFive-axis work — where the tool moves around the part — commands a premium over three-axis.
- Part typeRotating parts such as turbine blades, running at 15,000–20,000 RPM to tolerances measured in ten-thousandths of a millimetre, sit far above structural or stationary parts.
- Commercial modelBuild-to-print, where the OEM supplies the design, is the industry default. Build-to-spec, where the supplier designs to a performance requirement, earns more and is harder to displace.
Why the balance sheet looks worse than the business is.
Buy-to-fly ratios distort working capital, structurally. Dimensional tolerances in this industry run to a few microns, so a great deal of metal is bought and cut away. Ratios of 15:1 to 20:1 are normal — fifteen kilos of aerospace-grade billet procured to yield a kilo of flying part. Two consequences follow, and both are routinely misread. Inventory days look bloated when they are simply the shape of the process. And scrap sales form a legitimate, recurring line of revenue rather than an accounting oddity.
Lead times compound the effect. Aerospace-grade titanium and superalloy can take twelve to eighteen months to import, and minimum order quantities for first-article work force stocking well ahead of revenue. A supplier scaling into new programmes will show deteriorating working capital precisely when it is winning.
Qualification is the real barrier. Scaling requires roughly eighteen months of capital expenditure, one to two years to obtain AS9100 and NADCAP accreditations, and then first article inspection on each part. Only after FAI clearance does a supplier move from an experimental tranche — typically a low single-digit percentage of a contract — to bulk supply at thirty to forty percent. Nothing about that sequence can be compressed with capital alone.
The reward for clearing it is duration. Once a part is embedded in an aircraft programme, the revenue runs for the life of that programme: forty to fifty years is not unusual. Very few industrial contracts anywhere offer comparable visibility, and it is the single strongest argument for paying up for a qualified supplier.
Delivery, complexity, and programme fit.
On-time delivery
The clearest leading indicator of share gain. With parts of the Western supplier base delivering below half of commitments on schedule, reliable suppliers are being pulled into direct OEM relationships rather than sitting behind an aggregator.
Position on the complexity ladder
Titanium and superalloy work, five-axis machining, and rotating parts each carry pricing power that structural aluminium work does not. Moving up the ladder is worth more than moving up in volume.
Programme selection
Revenue must be modelled against the specific aircraft programme supplied. A narrowbody family building at scale offers a different revenue trajectory entirely from a low-rate regional programme, whatever the contract headline says.
What to answer before underwriting.
- →Programme exposure. Which aircraft programmes, at what build rates, and what proportion of revenue sits on each? This is the revenue model, not an appendix to it.
- →Build-to-print or build-to-spec. What share of revenue is designed by the supplier rather than to an OEM drawing, and is that share rising?
- →Material and machining mix. Titanium and superalloy versus steel and aluminium; five-axis versus three-axis capacity.
- →Rotating versus structural. Rotating parts carry the tolerance burden and the margin. What is the split?
- →Buy-to-fly ratio. The actual ratio by part family, and how much revenue is scrap recovery.
- →Certifications held. AS9100, NADCAP and the specific special-process approvals — and which are outsourced rather than in-house.
- →FAI clearance record. How quickly parts pass first article inspection, and how many are currently sitting between experimental and bulk supply.
- →On-time delivery rate. Measured against OEM schedule, not internal targets. The number that wins the next contract.
- →Tooling versus flying parts. Tooling demand is ad hoc; once built, a tool is reused for years. Flying parts are consumable and recur. What is the mix?
- →Vertical integration. Forging, surface treatment and special processes in-house or bought? Integration reduces lead time and captures margin, but adds fixed cost.
- →Skilled headcount plan. Precision machinists are the binding constraint on scaling. What is the hiring and training pipeline, and at what wage assumption?
- →Customer concentration. The airframer market is effectively a duopoly. How skewed is the book, and what happens if one of them slows?
What to monitor, quarter by quarter.
| KPI | Calculation / source | Benchmark or read-through |
|---|---|---|
| On-time delivery | Deliveries on schedule ÷ total, per OEM | The leading indicator of share gain; sustained high OTD wins direct contracts |
| ROCE | EBIT ÷ capital employed | The right comparator here — margin alone is distorted by structural inventory |
| Inventory days | Inventory ÷ COGS × 365 | High is normal; judge the trend against revenue growth, not the level |
| Buy-to-fly ratio | Input mass ÷ shipped mass | 15:1 to 20:1 typical; drives both inventory and scrap revenue |
| Scrap recovery | Scrap sales ÷ revenue | A legitimate recurring line, not an anomaly — but confirm pricing is arm's length |
| FAI clearance rate | Parts cleared ÷ parts submitted, and time taken | Governs how fast experimental tranches convert to bulk supply |
| Revenue by programme | Segment or management disclosure | Tie the model to the programme's build rate, not to company guidance |
| Build-to-spec share | BTS revenue ÷ total | Higher margin and materially harder to displace |
| Rotating parts share | Revenue from rotating components | The top of the complexity ladder |
| Titanium / superalloy share | Revenue by material class | Fewer capable competitors, so better pricing retention |
| Capacity utilisation | Machine hours used ÷ available | Capex precedes revenue by 18 months — watch the gap close |
| Machinist headcount | Skilled operators, and attrition | The real capacity ceiling; wage inflation shows up here first |
| Order book by duration | Contracted revenue and programme life | Programme embedment gives multi-decade visibility once qualified |
How the thesis breaks.
- !Skilled labour shortage. Scaling capacity several times over requires a proportionate increase in precision machinists. That pool is thin, and shop-floor wage inflation is the most likely margin surprise.
- !Airframer concentration. A duopoly buyer base means a single OEM's production issues, rate caps or labour disputes transmit straight into a supplier's quarter.
- !Tooling-weighted revenue. Tooling is ordered once and reused for years. A book skewed to tooling rather than consumable flying parts will struggle to compound.
- !Qualification slippage. Delays in NADCAP approvals or repeated FAI failures push revenue out by quarters, and the fixed cost is already sunk.
- !Working capital consuming the growth. Long material lead times and MOQ stocking mean a fast-growing supplier can be cash-negative for years. Fund the growth, or it stalls.
- !Programme rate cuts. Build rates are revised. Revenue tied to a programme that slows falls with it, regardless of contract length.
- !Capex ahead of qualification. Machines bought before parts are approved sit idle through the approval cycle, depressing returns exactly when the story sounds best.
The figures, and where they stand.
| Metric | Value | Note | Basis |
|---|---|---|---|
| Addressable market | ~$150bn | Component manufacturing and labour; India's share currently small | Research note |
| Passenger load factor | ~86% | Historically high; underpins the order book | Research note |
| Average global fleet age | ~15 years | Against roughly 11 years pre-pandemic | Research note |
| Western share of supply chain | 70–75% | The base under structural pressure | Research note |
| Buy-to-fly ratio | 15:1 to 20:1 | Input mass to flying mass | Process norm |
| Dimensional tolerance | To ~5 microns | Rotating parts tighter still | Technical |
| Turbine blade operating speed | 15,000–20,000 RPM | The reason rotating parts price differently | Technical |
| Raw material lead time | 12–18 months | Aerospace-grade titanium and superalloy imports | Research note |
| Certification lead time | 1–2 years | AS9100 / NADCAP, on top of ~18 months capex | Research note |
| Experimental to bulk tranche | 2–3% → 30–40% | Of contract volume, post-FAI clearance | Research note |
| Programme revenue life | 40–50 years | Once embedded in an aircraft programme | Structural |