ROI, ROA and ROE Applied to Aviation: What Each Ratio Measures with Aircraft on Your Balance Sheet

Three letters, three ratios, three different questions. ROI, ROA and ROE are the most cited profitability metrics in business, and they are routinely used interchangeably — including by people who should know better. In a capital-intensive, debt-heavy sector like aviation, that confusion isn’t just academic. It leads owners of ATOs and aeroclubs to celebrate numbers they should be worried about, and to worry about numbers that are actually fine.

This article takes the three ratios apart — what each one measures, what it deliberately ignores, and what it looks like when an aircraft sits in the middle of the calculation.

Why three ratios instead of one

If profitability were a single number, business analysis would be a lot simpler. But “profitability” is a question with several possible meanings:

Did this specific investment pay off? → ROI
Is the business earning a good return on everything it owns? → ROA
Is the business earning a good return on what the owners put in (or left in)? → ROE

Each ratio is the honest answer to one of these questions. Using ROI to judge a whole business is like judging a pilot by one landing. Using ROE to judge whether an individual project was worth it is like using the altimeter to check your ground speed — right instrument, wrong purpose.

The confusion is compounded in aviation because aircraft are simultaneously:

A large single investment (so ROI matters)
A dominant part of total assets (so ROA matters)
Usually debt-financed (so ROE diverges sharply from ROA)

A business that uses these three ratios thoughtfully tells itself the truth. A business that uses one and ignores the other two deceives itself.

ROI — the project-level question

Return on Investment is the simplest of the three and the one most commonly misused.

ROI = Net Gain from Investment ÷ Cost of Investment

It answers one question: for a specific investment, how much did we get back relative to what we put in?

In aviation, ROI is the natural ratio for evaluating discrete decisions: buying a particular aircraft, upgrading avionics, adding a simulator, opening a second base. The calculation is bounded — a specific cost, a specific return window, a specific net gain — and the number is meaningful precisely because the scope is defined.

A worked example: is this aircraft a good purchase?

Imagine an ATO considering buying a PA-28 for €70,000 to add to its fleet. The projected additional operating profit from the aircraft, after all its direct costs (fuel, maintenance, insurance, share of fixed costs), is €12,000 per year. Over five years, the aircraft is expected to lose €15,000 of market value (so its resale would net €55,000).

Total net gain over 5 years = (5 × €12,000) − €15,000 = €45,000
Investment = €70,000
5-year ROI = €45,000 ÷ €70,000 = 64.3%
Approximate annualised ROI ≈ 10.4%

Is 10.4% a good number? That depends on the cost of capital and the alternatives. But the ROI calculation has done its job: it has scored this specific purchase against what it cost. That’s what ROI is for.

What ROI does not see

ROI ignores the rest of the business. It doesn’t tell you whether the ATO as a whole is healthy. It doesn’t care how the aircraft was financed. It doesn’t distinguish between an owner who bought the aircraft with cash and one who bought it with a 90% loan — same ROI number, very different risk profile.

That’s a feature, not a bug. ROI is a project-level tool. When someone asks “what’s the ROI of the business?”, they’re misusing the ratio. The right tools for that question are ROA and ROE.

ROA — is the whole business earning on its assets?

Return on Assets zooms out from a single project and asks a business-wide question:

ROA = Net Profit ÷ Total Assets

It measures how effectively the business is using everything it owns to generate profit. Everything — aircraft, simulators, cash, receivables, facilities, tools. If the business has €800,000 of assets on its balance sheet and generates €40,000 of profit, ROA is 5%.

For aviation businesses, ROA is probably the most honest single ratio for evaluating operational performance. Here’s why.

Aircraft are heavy assets. They sit on the balance sheet at significant book values. A business with a fleet of four training aircraft easily has €200,000–400,000 in aircraft alone, before adding facilities, equipment, and working capital. That weight has to be justified — the business has to earn a respectable return on it, or those assets are sitting idle, depreciating, and consuming capital without producing.

ROA ignores how the assets were financed. An aircraft bought in cash and an aircraft bought with a 90% loan both show up at their full book value on the asset side. From ROA’s perspective, the question isn’t “how did we pay for the aircraft?” — it’s “given that we have the aircraft, is it pulling its weight?”

A worked example: aeroclub with four aircraft

An aeroclub has:

4 training aircraft at a combined book value of €280,000
Hangar, equipment, tools: €35,000
Working capital (cash, receivables, inventory): €55,000
Total assets: €370,000

The aeroclub earned a net profit of €22,000 last year.

ROA = €22,000 ÷ €370,000 = 5.9%

Is 5.9% acceptable? It depends on the benchmarks you’re using, which I’ll discuss below. But that number is already telling you something important: this aeroclub is earning roughly the return of a decent savings product on its asset base — except the asset base is a fleet of aircraft that requires insurance, maintenance, hangarage, regulatory overhead, and operational risk.

If ROA were 1.5%, the question becomes urgent: why are we owning this asset base at all, if it’s not earning meaningfully more than a treasury bond?

What ROA does not see

ROA doesn’t tell you about the owner’s return, because it ignores the debt. If the aeroclub above has €250,000 of loans, the owners’ real investment isn’t €370,000 — it’s €120,000 (equity). The same €22,000 profit against €120,000 of equity produces a very different number.

That number is ROE.

ROE — the owner’s return

Return on Equity measures the return from the perspective of the business owner — the people whose money is actually at risk.

ROE = Net Profit ÷ Total Equity

Equity is what’s left after you subtract all liabilities from all assets — the residual that belongs to the owners.

Continuing the aeroclub example

Same business. Same profit:

Total assets: €370,000
Total liabilities (mostly aircraft loans): €250,000
Total equity: €120,000

Net profit: €22,000.

ROE = €22,000 ÷ €120,000 = 18.3%

ROA was 5.9%. ROE is 18.3%. Same business, same year, same profit — the ratio jumped from mediocre to respectable because leverage (borrowed money) is doing some of the heavy lifting.

This is not an accounting trick. It’s a real economic effect. The owners have €120,000 at risk and are earning €22,000 on it — that is, genuinely, an 18.3% return on their capital. The bank is earning its interest on the other €250,000, and that interest has already been subtracted before arriving at net profit.

ROE is the owner’s dashboard. It’s the number you should care about if you’re the equity-holder: what am I earning on what I’ve committed?

The leverage effect, clearly

The difference between ROA and ROE comes entirely from leverage — the use of debt to finance assets.

If a business has no debt at all, ROE = ROA.
The more debt, the wider the gap, because a smaller and smaller slice of the business is funded by equity.

This is why aviation businesses, which tend to carry substantial aircraft loans, typically show ROEs well above their ROAs. It’s not a sign that the business is especially profitable — it’s a sign that leverage is amplifying whatever profitability there is.

It also cuts the other way. If the business has a loss instead of a profit, ROE goes deeply negative much faster than ROA, because the same loss falls on a smaller equity base. Leverage magnifies both directions.

How the three ratios connect — the simplified DuPont view

There’s an old and useful decomposition called the DuPont formula that links these ratios. The fully-academic version intimidates people; the simplified version is just arithmetic.

ROE = ROA × Leverage Multiplier

Where the leverage multiplier is Total Assets ÷ Total Equity.

For the aeroclub above:

Leverage Multiplier = €370,000 ÷ €120,000 = 3.08x
ROE = 5.9% × 3.08 = 18.3%

This decomposition lets you see exactly where ROE is coming from. If ROE is 18% and the leverage multiplier is 3x, then ROA is only 6% — the business is not very asset-productive; the ratio flatters because of borrowing. If ROE is 18% and the leverage multiplier is 1.2x, ROA is 15% — the business is genuinely productive on its assets and barely uses debt.

These two businesses have the same ROE, but the second is clearly stronger. ROE alone doesn’t distinguish them; ROA does.

Typical ranges in aviation (with big caveats)

Aviation is not homogeneous, and I’m going to deliberately avoid giving prescriptive numbers that could be treated as rules. But for orientation:

ROA for ATOs and aeroclubs typically falls somewhere in the 2%–8% range when the business is reasonably well-run and the fleet is reasonably utilised. Above 8% is strong; below 2% raises questions about whether the asset base is justified by the operation.

ROE for the same businesses can range much more widely, from low single digits to 25%+, almost entirely depending on the leverage profile. A well-run but highly-leveraged operation can show a very attractive ROE that masks only-average ROA. A conservatively-financed operation can show a modest ROE that reflects strong underlying ROA.

ROI on aircraft acquisition varies with aircraft type, utilisation, and price paid. A well-chosen trainer used at commercial levels of utilisation (800+ hours/year) often generates an ROI that comfortably exceeds the cost of capital. A poorly-chosen aircraft, used sub-commercially, can show negative ROI even over five-year horizons. The numbers depend almost entirely on the purchase decision quality.

The danger in citing ranges is that operators then reverse-engineer their spreadsheets to hit the numbers. I prefer to encourage a different discipline: understand what the ratio is asking, calculate it honestly, and compare to your own alternatives.

Specific places these ratios mislead in aviation

Depreciation method. Aircraft depreciation is an accounting choice that directly affects net profit — and therefore all three ratios. An ATO that depreciates aggressively (shorter useful life assumption) shows lower profit, lower ROA, and lower ROE than an identical operation that depreciates conservatively. Two businesses with identical operations can look very different on these ratios purely because of accounting policy. When comparing businesses, always understand the depreciation assumption before comparing the ratios.

Book value vs market value of the fleet. ROA uses total assets as the denominator, which includes aircraft at book value. If the fleet is significantly under-valued on the books (fully-depreciated aircraft still generating revenue), ROA looks artificially strong because the denominator is understated. If the fleet is over-valued on the books (market has fallen below book value), ROA looks weaker than it actually is. A useful supplementary calculation: ROA using a realistic market value of the fleet instead of the book value.

Deferred income distortion. If the business carries large amounts of student prepayments (deferred income) as a liability, the equity is understated at that moment. ROE will look elevated. This doesn’t mean the business is genuinely more profitable for its owners — it means the owners have, temporarily, a smaller equity base because of timing. When ATOs take large course prepayments, ROE snapshots during the year can be misleading without an adjustment.

One-off items. An aircraft sale in the year, a tax settlement, an insurance windfall — any non-recurring item affects net profit and therefore all three ratios for that year. When reading a single year’s ratios, always ask whether the profit figure is representative of the operational run rate or distorted by one-offs.

Confusing ROI scopes. ROI can be calculated on a single purchase, a single project, a single year, a multi-year period, or even the whole life of a business. These are all legitimate uses, but they are different numbers. When someone quotes an “ROI” figure without specifying the scope and time horizon, ask clarifying questions before acting on it.

The practical recipe for an aviation operator

In daily management of an ATO, aeroclub, or aircraft-owning operation, I’d argue for the following rhythm:

Use ROI when making a specific decision. Should we buy this aircraft? Add this simulator? Open this base? Build the calculation for the specific project, over a realistic horizon, with honest assumptions. That’s where ROI shines.

Use ROA to evaluate the business as an operational entity. Once or twice a year, strip away the financing question and ask: is this fleet, this facility, this equipment earning enough to justify owning it? That’s ROA. If ROA is weak, the operation has a productivity problem that no amount of restructuring the debt will fix.

Use ROE to evaluate the business as an owner’s investment. Once a year, look at ROE and compare it to the alternatives available to the capital you have committed. Is your €120,000 of equity earning enough to justify leaving it in this business, given the risk?

Track all three over time. A business where ROA is declining but ROE is stable is a business where leverage is creeping up to compensate for operational deterioration. That’s not always visible from a single year’s snapshot; it shows up in the trend.

The three ratios are not competing — they’re complementary. Each is the correct answer to a specific question, and each has blind spots that the others fill in. In aviation, where aircraft are major assets, debt is usually significant, and individual purchase decisions are large, no serious operator can afford to use only one of them.

Next week I’ll take the most useful of the comparisons — ROE vs ROA — and zoom into the specific tension between them that shapes most aviation operations: when the fleet is working for the owner, and when the owner is working for the fleet. If you want a structured view of where your operation really stands on these ratios, including the specific adjustments that make them meaningful for an aviation context, that’s the kind of analysis I do as part of independent advisory.

ROI, ROA and ROE Applied to Aviation: What Each Ratio Measures When You Have Aircraft on Your Balance Sheet