Casebook ~ Finance ~ Coursework / capital budgeting

Should an airline lease or buy its next fleet?

An airline needed additional aircraft capacity and had to choose between leasing and owning. The comparison depended on cash flows, flexibility and balance-sheet constraints over the fleet’s life.

Context Coursework / capital budgeting
My role [NPV model & scenario analysis]
Timeline [X weeks]
Result [Fleet financing recommendation]
The answer, up front

Choose the fleet option that best balances value and flexibility.

[$X] NPV difference under the base case
[X years] planning horizon for the comparison
[N] fuel, rate and utilisation scenarios
01 · Frame

Find the real question

Situation. The airline expects to add aircraft to support its route and capacity plan. Both leases and purchases can meet the requirement, but they allocate risk and capital differently.

Complication. Purchase economics depend on financing, residual value and maintenance exposure. Lease terms affect flexibility, utilisation commitments and future renewal options; fuel, rates and demand remain uncertain.

“For the aircraft and routes in scope, should the airline lease or buy, and under what conditions would that answer change?”

A good answer had to show:
~Compare like-for-like aircraft, timing, utilisation and operating assumptions.
~Include financing, tax, maintenance, return conditions and residual value.
~Stress-test flexibility and downside exposure alongside headline NPV.
02 · Structure

Compare full-life economics and strategic flexibility

I framed the choice around value, risk and fit with the route plan. The analysis must compare equivalent capacity and make the option value of flexibility explicit.

Lease or buy the next fleet tranche?
Which aircraft and for what use?Route and capacity plan
Utilisation and timing
Fleet commonality
What does each option cost?Lease rentals and conditions
Purchase and financing cash flows
Maintenance and residual value
Which risks can the airline carry?Fuel and interest rates
Demand and utilisation
Flexibility and fleet exit
Hypotheses I set out to test
H1The preferred option may differ by aircraft type, route certainty and expected holding period.
H2Residual value and financing costs are likely to drive the purchase case, while return conditions drive lease risk.
H3A mixed fleet financing strategy may preserve capacity flexibility under uncertain demand.
03 · Analyse

Compare equivalent capacity across the full decision horizon

3.1

Set a like-for-like operating case

Aligned delivery dates, aircraft utilisation, fuel burn, maintenance assumptions and capacity contribution for each financing option.

[Visual: aircraft and route assumptions]

Insight: [Aircraft / route group] is the best first comparison because its utilisation and demand are most predictable.

3.2

Build lifecycle cash flows

Modelled lease rentals and end-of-term obligations against acquisition, financing, maintenance, tax and residual-value cash flows.

[Visual: discounted cash flow by year and option]

Insight: [Cost item] explains most of the base-case NPV gap between lease and buy.

3.3

Stress-test uncertainty and flexibility

Varied fuel, rates, utilisation, residual value and demand; compared break-even points and the cost of returning or retaining aircraft.

[Visual: sensitivity tornado and break-even chart]

Insight: the recommendation switches if [driver] moves beyond [threshold]; preserve flexibility where exposure is asymmetric.

Compare NPV and option value under shared assumptions

Keep the operating case constant and show how the financing decision moves when the largest uncertain inputs change. Values below are placeholders for the case model.

Decision measureLeaseBuyMixed fleet
Base-case NPV[$X][$X][$X]
Initial cash requirement[$X][$X][$X]
Residual-value exposure[Low / med / high][Low / med / high][Mixed]
Flexibility at term end[Option][Option][Option]
Break-even utilisation[X%][X%][X%]
04 · Recommend

Match financing to aircraft use and demand certainty

Choose [lease / buy / mixed] for the aircraft tranche where the full-life economics are strongest after including financing, maintenance and exit costs. Preserve flexibility for routes with uncertain demand, and make the decision conditional on the rate, residual-value and utilisation thresholds identified in the model.

Weeks 0–3DefineConfirm aircraft, routes, delivery timing, utilisation and financing constraints.
Weeks 3–6ModelBuild equivalent cash flows and sensitivities; validate lease and purchase terms.
Weeks 6–8DecideApprove the option by aircraft tranche, with thresholds and negotiation points documented.
Risks, and how to manage them
Residual value is optimisticUse independent market evidence and downside cases for aircraft exit values.
Lease terms hide future costReview maintenance reserves, return conditions, escalation and extension options.
Fleet plan changes after commitmentStage decisions by tranche and align capacity with route-demand gates.
05 · Looking back

What I would keep, and what I would change

What worked

[What made the comparison fair, such as holding aircraft utilisation and timing constant.]

What I would do differently

[What contractual or market input you would validate earlier.]

Sample case page: replace bracketed values with verified project details before publishing.

← Back to all cases Next caseShould a regional D2C skincare brand go offline? →

Want to talk through this case?

Happy to walk you through the model and the thinking behind it.

checkneilroy@gmail.com LinkedIn →