Aircraft Makers Book Profit on Planes They Have Not Built Yet
Program accounting spreads the cost of an aircraft programme across hundreds of future deliveries. It is legitimate, it is required, and it depends entirely on forecasts that can be wrong for years before anyone finds out.
The Problem It Solves
Building the first unit of a new aircraft is extraordinarily expensive. Tooling is new, the workforce is inexperienced, and errors are frequent. By the hundredth unit the same aircraft costs dramatically less, because of the learning curve, the well documented tendency for unit cost to fall by a consistent percentage each time cumulative output doubles.
If you expensed the actual cost of each aircraft as delivered, the first years of a programme would show catastrophic losses and the later years would show enormous profits. Neither would represent the economics of the programme, which is a single long investment.
How Program Accounting Works
Instead, the manufacturer defines an accounting quantity, meaning the number of aircraft it expects to deliver over the programme, then estimates total revenue and total cost across that entire run. Each delivery is recorded at the average cost, not the actual cost.
Early on, actual cost exceeds the average, and the difference accumulates on the balance sheet as deferred production cost. Later, when actual cost falls below the average, that deferred balance unwinds.
Deferred production cost is a promise that future aircraft will be cheap enough to pay for how expensive the early ones were.
What Makes It Fragile
The method requires three forecasts that stretch over decades: how many aircraft will be sold, at what prices, and at what cost. Change any one and the accounting shifts.
| Assumption | If it proves optimistic |
|---|---|
| Total units delivered | Fixed cost spreads over fewer planes |
| Average selling price | Programme margin falls |
| Cost improvement rate | Deferred balance may never unwind |
The danger is that the errors are invisible for a long time. A programme can report a positive margin every quarter for years while the deferred balance quietly grows, and the reckoning arrives all at once as a forward loss charge, which is the recognition that the remaining programme will lose money in total.
Reading the Deferred Balance
For an aircraft manufacturer, the deferred production balance is one of the most informative numbers disclosed, and it appears in the notes rather than on the face of the income statement.
A rising balance early in a programme is expected. A balance that keeps rising well past the point where the learning curve should have taken hold is a signal that either costs are not improving as projected or deliveries are running behind. A balance that is not unwinding as the programme matures is a warning that the averaging assumption is failing.
Why the Industry Is Structured This Way
Large commercial aircraft is a duopoly with a backlog measured in years of production. Both features shape the accounting.
A long backlog makes the delivery forecast look reliable, which supports a large accounting quantity, which lowers the average cost per unit. But a backlog is a set of orders, not guaranteed deliveries. Orders can be deferred or cancelled, and they cluster with airline cycles, so the backlog is most likely to shrink exactly when a manufacturer most needs it to hold.
The General Lesson
Any accounting method that averages costs across a long future horizon converts uncertainty into current reported profit. Percentage of completion accounting on long construction contracts has the same property, and so does content amortization at a streaming company.
None of these are improper. They exist because the alternative misrepresents the economics worse. But they all mean the same thing for a reader: reported profit contains a forecast, and you should find the disclosure that tells you what the forecast is.
The Bottom Line
Program accounting is the honest way to report a business where the first unit costs several times the hundredth. It also means an aircraft manufacturer can report profits for years on the strength of assumptions about deliveries far in the future. The deferred production balance is where you check whether those assumptions are holding.