Zero-Based Budgeting in a Flight School: What Would You Cut if You Had to Justify Every Line from Scratch?
In the last two posts I covered stress testing — asking what breaks when shocks hit — and sensitivity analysis — ranking your operation’s exposures by how much they move the bottom line. Both tools look outward at risk. They assume, implicitly, that the cost structure you start with is more or less the right one.
Today I want to look inward, at the cost base itself. And the tool I want to discuss is uncomfortable, confrontational, and — for most flight schools and aeroclubs I’ve worked with — the single exercise that has liberated the most cash.
It’s called zero-based budgeting (ZBB), and the premise is simple to describe and hard to execute: take a blank sheet of paper and rebuild your entire cost base from zero, line by line, justifying each expense on its own merits as if you were launching the operation tomorrow. No inheritance from last year. No “we’ve always paid this.” No line that just sits there because nobody’s ever questioned it.
Why most P&Ls are built by inheritance
The default way flight schools, aeroclubs, and small operators build their annual budget is not really budgeting at all. It’s incremental updating: take last year’s P&L, adjust each line for expected inflation (usually 2–4%), add or remove a few items for known changes in the operation, and sign the document. This takes an afternoon. It changes, on average, maybe 5% of the cost base year to year.
The problem is that the cost base itself was built by the same process in reverse. Every line there exists because someone, at some point, added it. Almost no lines ever get removed, because removing a line requires a conversation — with a supplier, with a team member, with a legacy practice — that incremental budgeting quietly avoids.
After five or ten years, the result is a cost base that contains a sedimentary layer of expenses that nobody remembers starting, nobody is actively defending, and that nobody would begin paying today if they saw it listed for the first time. I’ve seen this pattern in every aviation operation I’ve audited above a certain age. The specific items vary — an old software subscription that the person who chose it has left, insurance riders that made sense three aircraft ago, a marketing retainer that produces no measurable leads, a vendor relationship that continues by habit — but the pattern is identical.
Zero-based budgeting is designed to strip that layer away.
What zero-based budgeting actually is
The mechanism is straightforward. You take your current annual P&L and, for each line, pretend it doesn’t exist. Then you decide, from scratch, whether to include it in next year’s budget, and at what amount.
Each line has to earn its place with three questions:
- What does this line actually buy us? Not what it’s named, but what concrete operational outcome depends on it.
- What would happen if we reduced it to zero? The honest answer, not the reflexive one.
- Is there a cheaper way to achieve the same operational outcome? Alternatives you’d never consider if you took the line as given.
Lines that survive the three questions go back in, often at the same amount, sometimes at a lower one. Lines that don’t survive — and there are always some — come out. A portion of lines gets restructured: same outcome, different supplier, different delivery mechanism, lower cost.
Done honestly, this exercise produces two outputs. First, a rebuilt cost base that’s typically 8–15% lower than the one you started with. Second — and this often matters more over time — a much clearer understanding across the management team of why each remaining line is there, which in turn makes future decisions about costs much better informed.
Why flight schools especially benefit from this
Training operations accumulate legacy costs faster than most businesses, for three reasons I’ve seen repeatedly:
Regulatory compliance creates sacred-cost reflexes. When a line is associated, even loosely, with a compliance requirement, it tends to acquire a halo of un-questionability. “We pay this because the regulator expects it” is a sentence that often survives even when the specific expense is no longer actually required, or is required in a much-reduced form compared to when it was first added.
Safety-adjacent spending is hard to challenge culturally. Flight schools rightly put safety first, but the consequence is that anything that can be labelled as “safety-related” tends to be approved at whatever level it was last set at. Over years, this lets genuinely important safety spending coexist with peripheral items that got in under the same heading and have stayed there.
Small team means no systematic cost review. Large companies have finance departments whose job is to question costs. A small ATO has an owner or a part-time bookkeeper whose job is primarily to pay invoices on time. Cost scrutiny is nobody’s job, so it doesn’t happen — until the exercise is deliberately created.
The five-step method
Here’s the method I use when running a ZBB engagement for an aviation operator, stripped to essentials.
Step 1 — Define decision units. A decision unit is a coherent slice of cost that can be meaningfully evaluated as a block. For a flight school, typical decision units are: aircraft operations (per aircraft), instruction delivery, CAMO and maintenance, ground facilities, administration, marketing, compliance, and owner’s overhead. Don’t make them too granular (you’ll drown in detail) or too broad (you won’t be able to make meaningful calls).
Step 2 — For each decision unit, build from zero. List, on a blank page, what that unit would cost if you were starting an equivalent operation tomorrow. This is the crucial discipline. You’re not editing last year; you’re designing next year from scratch. What staff, suppliers, services, and consumables would you buy? At what frequency? At what price?
Step 3 — Rank each unit’s expenses by necessity. Within each unit, sort the lines into three buckets:
- Must-have: the operation cannot function without this, or a very close substitute.
- Should-have: the operation would function without this, but meaningful quality, efficiency, or compliance depreciation would follow.
- Could-have: nice to have, supports comfort or convenience, but the operation would run acceptably without it.
Step 4 — Prioritise within a budget envelope. Decide how much you can afford to spend in total — either anchored to expected revenue (e.g. 75% of projected flight revenue as total cost base) or set by a cash target. Fund the must-haves in full. Fund the should-haves in rank order. Stop at the envelope line. Everything below that line is, this year, excluded.
Step 5 — Implement with discipline. The hardest part. The new budget must become the one the operation actually follows, not an academic exercise that sits in a drawer while the legacy pattern continues. That means renegotiating with specific suppliers, ending specific contracts, reassigning specific people — real organisational work, not a spreadsheet exercise.
A worked example: rebuilding an ATO from zero
Let me make this concrete with the same ATO Meridian from the earlier posts. Baseline fixed costs, as previously described: 385,000 € annually. Here’s how a ZBB exercise typically lays out.
Aircraft-operations unit (baseline 125,000 €): Includes hangar rental, parking fees, tie-downs, ground-handling, and related per-aircraft costs. Rebuilt from zero: a new ATO with four aircraft needs hangar space (must-have), parking rights at the operating airfield (must-have), and ground-handling contracts (must-have). When we look at what’s actually being paid, three out of four aircraft have redundant tie-down spots from an earlier phase of the operation, costing 3,000 € that buys nothing. Hangar rent has been renewed annually without being benchmarked — when benchmarked, a 4,000 € saving is available. Parking at a secondary airfield that the operation stopped using two years ago still appears on the bills at 1,800 €. Total savings identified: ~8,800 €.
Instruction delivery unit (baseline 165,000 €): Staff salaries, contract instructor fees, ground-school provision, simulator access. Rebuilt from zero: the school needs enough instructors to deliver its sold hours. Current payroll is scaled to a previous peak of activity; one FTE position could be converted to part-time without jeopardising current delivery. Simulator access is charged at a frequency that exceeds actual usage by about 30% — a renegotiation, or a move to a pay-per-session model, is plausible. Total savings identified: ~18,000 €.
CAMO and maintenance oversight (baseline 35,000 €): External CAMO contract, periodic inspector fees, admin overhead. Rebuilt from zero: a four-aircraft operation has a specific minimum maintenance-oversight footprint. Current CAMO contract has two sub-fleet provisions for aircraft types the operation no longer operates. When trimmed to current fleet, a 2,500 € reduction is available without changing compliance status. Total savings identified: ~2,500 €.
Administration unit (baseline 28,000 €): Accounting, legal, software subscriptions, office consumables, office rent component. Rebuilt from zero: the operation needs accounting services and a small set of software tools. The current subscription stack includes three overlapping scheduling tools (one chosen by a former ops manager, another by the current chief instructor, a third by the owner) — a consolidation is overdue. A compliance-reporting tool used daily is priced at the high-volume tier, but current usage is low-volume. Total savings identified: ~4,000 €.
Marketing unit (baseline 12,000 €): Website hosting, content retainer, small-scale advertising spend. Rebuilt from zero: the school needs a website and some structured demand generation. The content retainer has produced 4 blog posts in the last 18 months — not usable output. The advertising spend is untracked, so its contribution is unmeasurable. Total savings identified: ~6,000 €.
Owner’s overhead and discretionary (baseline 20,000 €): Travel, professional development, memberships, entertainment of clients and partners. Rebuilt from zero: legitimate expense categories, but the specific line-by-line pattern has drifted. A conference retainer and three industry memberships are identified that no longer map to current strategic priorities. Total savings identified: ~3,000 €.
Legacy lines unit (baseline — scattered, ~10,000 €): Anything that doesn’t fit the units above. Dormant vendor relationships, an old insurance rider, consumables for equipment no longer in use. Rebuilt from zero: this unit goes to zero entirely and is rebuilt only with items that pass the three-question test. Total savings identified: ~8,500 €.
Sum of savings identified: roughly 50,000 € out of a 385,000 € fixed-cost base. A 13% reduction. None of it compromises safety, compliance, or core delivery. All of it comes from removing, renegotiating, or restructuring items that nobody, in the cold light of ZBB, could defend.
That’s a fairly typical result. Sometimes it’s less — 8% or 10% — in operations that have been well run historically. Sometimes it’s more — 18% or 20% — in operations where legacy sediment has accumulated over many years. I have never, in any operation I’ve run this exercise on, seen it come back with zero savings identified.
What this does to the P&L
Taking that 50,000 € saving through to the bottom line: Meridian’s projected net profit moves from 63,000 € to roughly 113,000 €, an 80% increase. Equivalently, the annual margin moves from about 8.5% to about 15%. The operation hasn’t grown revenue, hasn’t changed its pricing, hasn’t raised a single rate. It has simply stopped paying for things that weren’t being defended.
Put differently: the same cost reduction would require, from the sensitivity analysis in last week’s post, an hourly rate increase of roughly 8% (220 € → 238 €). That rate increase might be negotiable, but it would be a market-facing move that takes time, messaging, and customer-facing effort. The ZBB saving is inward-facing and within the owner’s direct control.
The cultural resistance (and how to overcome it)
In my experience, the resistance to ZBB rarely comes from the numbers. It comes from the cultural discomfort of questioning things that have been taken for granted. The head of instruction may bristle at being asked to justify a simulator subscription that was chosen three years ago. The accounts manager may defend a software subscription because they’re fond of the supplier. The owner may have personal comfort in a particular membership or retainer that the numbers don’t support.
Three things help, all of which I learned the hard way:
Do the exercise collaboratively, not confrontationally. When the head of instruction is asked to rebuild the instruction unit from zero, alongside the owner, with a shared goal of a defensible budget, the conversation is different from when they’re told “justify this line or we’ll cut it.” Same outcome, radically different social dynamics.
Make the comparison transparent. The three-question test applied to every line levels the playing field. If one line survives because it buys a specific operational outcome, and another line doesn’t survive because it doesn’t, the decision is structural rather than personal.
Commit to reinvestment, not extraction. If the ZBB exercise is framed as “find savings so the owner can take more out,” it meets understandable resistance from the team. If it’s framed as “find savings so we can invest in things that matter — a backup aircraft, a new instructor position, a proper scheduling system” — the team is on the same side as the exercise. The framing matters as much as the method.
The frequency question
How often should a flight school run ZBB? My answer: the full exercise every three to four years, with a shortened version — perhaps half a day — each year. The full exercise is too disruptive to run annually; the annual check stops small amounts of sediment from accumulating between full exercises. Think of it as the difference between a major overhaul and a 100-hour inspection.
The owner-pilot version
Everything above applies, in miniature, to an owner-pilot with one aircraft. The cost base looks different — hangar, insurance, fuel, reserves, loan service, annual inspection, personal training currency costs — but the exercise is the same. If you were buying the aircraft today, with today’s understanding of how you actually fly, what would you pay for and at what level? I’ve sat down with owner-pilots who were carrying 3,000–5,000 € of annual cost on insurance riders, hangar features, or consumables that had made sense to the previous owner or to a version of themselves three years ago, but that couldn’t be defended today.
A weekend. A blank sheet. Each line on its own merits. That’s the whole method.
Next in the sequence
Zero-based budgeting rebuilds the cost base. Stress testing asks what happens when shocks hit it. Sensitivity analysis ranks which variables most affect the outcome. Next week I close this four-post block on financial resilience with scenario planning — the synthesis exercise. Instead of one plan and a handful of shocks, you build three coherent forward-looking scenarios (A, B, C: optimistic, base, pessimistic) for your operation, and design decisions — hiring, pricing, CAPEX, cash buffer — that survive across all three. It’s the capstone of the resilience-building toolkit.
Zero-based budgeting is one of those exercises where the first time feels awful and every subsequent time feels indispensable. The first time, the conversations are hard. The first time, you find lines you’re personally attached to that don’t survive the test. The first time, it’s tempting to stop halfway and leave “just one or two” items untouched out of loyalty or habit.
By the second or third time, it’s a routine. And by the time you’ve done it twice, the sediment layer has been removed and the annual check is short and manageable — because the cost base has stayed defensible instead of being allowed to drift.
At AYRAM we’ve run this exercise for ATOs, aeroclubs, and aircraft owners as part of broader strategic reviews or as a standalone cost engagement. As independent buy-side advisors we have no stake in any of the vendor relationships we ask you to question — no commissions, no kickbacks, no supplier partnerships — which is exactly what you want in the person running this kind of exercise for you.
If it’s been more than three years since your cost base was built from scratch rather than inherited, the odds that a weekend of structured ZBB would pay for itself several times over are very high. Sometimes it takes a conversation from the outside to start it; we’re happy to be that conversation.