Your collection, sorted by who built it
The aircraft half of your collection has had two views since it was split from the ships: by type, which groups your airframes under the designator they share, and all airframes, the flat chronological wall. There is now a third: by manufacturer.
It does what it says. Every type you have collected, grouped under the company that built it, biggest maker first, each heading carrying how many types and how many airframes sit beneath it and linking to that manufacturer's own page. Types whose builder we do not know go to the bottom, in one bucket, rather than pretending to be a company.
Why this grouping and not the obvious other one
The natural request is "group by airline" — and that one does not work the same way, for a reason worth stating rather than quietly ignoring.
A type has exactly one manufacturer. An A320 was built by Airbus and by nobody else, so grouping types under builders is a real hierarchy: nothing is duplicated, every airframe is counted once, and the number in the heading is simply true.
An airline is not like that. An A320 is flown by Lufthansa, by Eurowings and by a hundred others, so "types by airline" is not a tree — the same type would have to appear under every operator that flies it, and every count in every heading would overlap with every other. Grouping by airline has to group airframes, not types: your tails, filed under whose colours they wear. That is a different view, and it is not built yet; the Airlines shelf you already have on the same page is its ancestor.
A small note on how it is built
The tile that draws one type was moved out of the flat wall so the identical tile can be laid out under a heading — the same component, two arrangements, rather than two versions of a card that would slowly drift apart.
The new view also renders only while you are looking at it, unlike the two older ones which stay in the page even when hidden. That is deliberate in both directions: the old views stay so that every aircraft link in them remains crawlable, and this one does not, because it contains exactly the same links and a third copy would cost you page weight and buy nothing.