Segment
Everything inside the cabin is certified hardware, held to the same regulatory machinery as the airframe. That is the fact the industry keeps rediscovering: an airline cannot take a finished aircraft whose business class seat has not been approved, and for several years that has been a real constraint on deliveries rather than a footnote to them.
In one sentence
Cabin interiors are the certified equipment installed inside the pressure vessel — seats, galleys, lavatories and stowage, the entertainment and connectivity system, and the cabin's lighting and power fit — approved both as articles and as an installation in a specific aircraft.
The cabin is where an airline differentiates a product that is otherwise identical to its competitor's, so it is specified in enormous detail: seat pitch and class mix, the fabric, the galley count, the screen size, whether the business seat has a door. Almost all of it is buyer-furnished — chosen by the airline, bought from suppliers the airframer does not control, and delivered into a slot on a final assembly line that will not wait.
That arrangement works while the equipment is a variation on something already approved. It stops working when the airline specifies something new, because a cabin fit needs approval twice: once for the article itself, and again for the installation in that aircraft, with that layout, those exits and those escape paths. The second approval is the one that queues, and a premium seat is now a multi-year engineering programme with a certification campaign attached.
The result has been visible in delivery numbers. Both large airframers have said outright that cabin certification and seat supply held up aircraft they had otherwise finished — jets parked with an incomplete or unapproved premium cabin, waiting on a supplier and an authority rather than on anything the manufacturer builds. It is the clearest current example of this industry's general rule: the constraint is rarely the engineering.
Split by the item an airline specifies and an authority approves separately.
Seats, galleys and entertainment systems are typically ordered by the airline from suppliers on an approved list, and shipped to the airframer to be installed. It gives the airline control of its product and gives the airframer a schedule dependency it cannot manage directly: a late seat is somebody else's supply chain arriving at somebody else's factory gate.
A seat or a monument is approved as an article against its own requirements, and then the installation is approved again — the layout of passenger accommodation, exit access, escape path width, the placement of monuments relative to doors. Change the cabin and the second approval is redone even where every part is already certified, which is why a new cabin on an existing aircraft type is a certification project in its own right.
Interior materials are governed by flammability requirements that get stricter with the size of the surface: fabric and small parts to a burner test, large panels — sidewalls, ceilings, stowage, galleys — additionally to heat release and smoke density limits. Toxicity of the smoke is not an airworthiness requirement in the same way, but the airframers impose their own limits through their material specifications, so in practice it is a requirement anyway.
Everything in the cabin is carried for the life of the aircraft, so a kilogram of seat or screen is paid for in fuel on every sector for thirty years. That is the argument behind lightweight seat structures, thinner monuments and the move from seat-back hardware to wireless delivery — and it is why the trade between passenger comfort and mass is made explicitly rather than by feel.
2 of these are marked as a chokepoint: a handful of qualified suppliers, a multi-year lead time, or a single geography.
Every item is approved as an article and the cabin is approved again as an installation; the second approval has repeatedly been the item that aircraft wait on.
Type certificationMonuments, seat shells and shrouds are honeycomb-cored composite panel qualified to the same material specifications as the airframe's secondary structure.
Composite materialsSeat frames, monument hardpoints and seat track fittings are machined metal, and they carry the crash loads the whole cabin is certified against.
Aluminium mill productsThe people qualified to run a cabin compliance campaign — sled test planning, escape path analysis, flammability evidence — are a small population, and they are the binding constraint when several airlines specify new cabins at once.
Other pages in this map that name Cabin interiors as something they cannot do without.
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.
Passenger seating · Galleys and monuments · IFE and connectivity · Lighting and power
11 more companies appear at a single step each; they are named on the pages for those steps.
Whether cabin certification stops appearing in airframers' explanations of missed deliveries.
Whether authorities publish clearer guidance on suites with doors, which is where interpretation has moved most.
Whether airlines shorten cabin specifications to reuse already-approved configurations rather than commissioning new ones.
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