Industry
Commercial aerospace: airframes, engines, systems and space
Aerospace is the branch where the interesting constraints are least technical. The materials and the thermodynamics are hard, and they are not what limits output — a certification process measured in years and a supply chain whose deepest tiers cannot go faster are.
An airliner is a composite and titanium structure, two engines running above the melting point of their own blades, and a set of systems designed so that catastrophic failure is extremely improbable. Each of those is genuinely difficult, and none of them is what limits how many aircraft get delivered.
What limits delivery is the combination of a certification process that takes years and cannot be compressed with money, and a supply chain in which a forging press, a casting foundry or a single qualified sub-tier supplier sets the pace for everyone above it. That is why this branch gives certification and production rate a segment of their own rather than treating them as background.
The cabin is the same argument in its most literal form. Seats, galleys and entertainment systems are certified hardware, mostly bought by the airline rather than the airframer, and finished aircraft have sat undelivered waiting for a business class seat to be approved. That is why cabin interiors are a segment here rather than a paragraph inside structures.
The industry's economics follow from its service life. An aircraft flies for thirty years, so far more value accrues after delivery than at it — which is why engines are sold at a loss, why aftermarket rules about who may make a replacement part are commercially decisive, and why a programme's installed base matters more than its current order book.
Space sits in this branch because it shares the supply chain: the same composites, the same forgings, the same qualification culture, and in several cases the same companies. Two changes — reusable boosters and satellites built on production lines — turned it from a government programme into an industry, and the links from those pages run into optics and data centres rather than staying in aerospace.
How this breaks down
Split by subsystem, plus the certification and rate machinery that gates all of them.
- Commercial aerospacethis page
- Airframes and structuresComposite fuselages, the tiered supplier system that builds them, and the metal that is still irreplaceable.Breaks down into: Composite materials · Composite airframes · Aerostructures tiers · Titanium and forgings · Aluminium mill products7 pages belowChokepoint
- PropulsionTurbofan architecture, the materials that survive the hot section, the aftermarket, and the fuel question.Breaks down into: Turbofan architecture · Hot-section materials · Engine aftermarket · Sustainable aviation fuel10 pages belowChokepoint
- Avionics and systemsFly-by-wire, cockpit systems and actuation — and the redundancy culture that governs all of them.Breaks down into: Fly-by-wire · Cockpit avionics · Landing gear and actuation3 pages belowChokepoint
- Cabin interiorsSeats, galleys, entertainment and the cabin electrical fit — certified hardware, and repeatedly the item an aircraft is waiting for.Breaks down into: Passenger seating · Galleys and monuments · IFE and connectivity · Lighting and power4 pages belowChokepoint
- Certification and ratesType certification, production rate ramps and the aftermarket rules — the non-technical constraints that dominate.Breaks down into: Type certification · Production rates · MRO and parts3 pages belowChokepoint
- Space systemsReusable rockets, satellites built in factories, and the terrestrial infrastructure that makes them useful.Breaks down into: Rocket engines · Orbital launch · Satellite constellations · Ground segment4 pages belowChokepoint
What this depends on
4 of these are marked as a chokepoint: a handful of qualified suppliers, a multi-year lead time, or a single geography.
- Supply chainChokepoint
Forgings, castings and specialty alloys
A small number of presses and foundries supply structural and hot-section parts that have no substitute process.
Titanium and forgings - StandardChokepoint
Airworthiness certification
Design approval, production approval and continued airworthiness govern what may be built, changed and fitted.
Type certification - Supply chainChokepoint
Aerospace carbon fibre
Qualified fibre comes from few producers and is shared with wind energy, and qualification is programme-specific.
Blades and composites - Supply chain
Long-life qualified semiconductors
Avionics parts must be supported and qualified for decades, which keeps this industry on nodes the rest of the world has left.
Foundry and capacity - Supply chainChokepoint
Sustainable aviation fuel
Emissions rules and blending mandates apply to the fleet already flying, and a drop-in fuel is the only lever that reaches it. Volume is bounded by feedstock rather than by refining, so the constraint on growth is a fuel supply the industry does not control.
Sustainable aviation fuel
Companies across Commercial aerospace
Every company named on a step below this page, ordered by how many of those steps it appears at. Compiled from the pages themselves rather than written separately, so the two cannot disagree. Not a ranking and not a recommendation.
- SafranParis15 steps
Fan and LP system · Fan drive gearbox · Single-crystal castings · Coatings and cooling holes · Ceramic matrix composites · Engine aftermarket · Fly-by-wire · Cockpit avionics · Landing gear and actuation · Passenger seating · Galleys and monuments · IFE and connectivity · Lighting and power · Production rates · MRO and parts
- Rolls-RoyceLondon6 steps
Fan and LP system · Engine core · Fan drive gearbox · Single-crystal castings · Coatings and cooling holes · Ceramic matrix composites
- AirbusParis5 steps
Composite airframes · Aerostructures tiers · Type certification · Production rates · Satellite constellations
- MTU Aero EnginesGermany5 steps
Fan and LP system · Engine core · Fan drive gearbox · Coatings and cooling holes · Engine aftermarket
- SpaceXPrivate4 steps
IFE and connectivity · Rocket engines · Orbital launch · Satellite constellations
107 more companies appear at a single step each; they are named on the pages for those steps.
How these pages are written
Each page explains one technology in plain language, states what it depends on, and names companies by what they supply at that step. Company roles are described qualitatively and deliberately carry no market shares, revenue figures or rankings — those change faster than an explainer can, and a stale number is worse than none. Ticker links point at company pages on this site and are provided for reference only.
Nothing here is investment advice, a recommendation, or a forecast. A company named on a page about a technology is not thereby a good investment, and the chokepoints described are structural facts about supply chains rather than predictions about prices. Technology moves; where a page describes something as unresolved or in development, that was true when it was written.
Plutux is not an investment adviser. Market data and AI-generated analysis are for information and education only, not investment advice. Disclaimer