The list price of a passenger aircraft can reach hundreds of millions of dollars, and an aircraft that is bought may stay in the fleet for fifteen to thirty years. In such a large and long-term investment, how does an airline decide which aircraft to buy, when, and how many? In this lesson we examine, step by step, the definition and objectives of fleet planning, the economic evaluation process, the changes that affect fleet planning and how an aircraft is evaluated before it joins the fleet.

Note on the period: The aircraft prices and leasing rates mentioned in this lesson belong to the period in which the source was published; current values may change over time.

What will you learn in this episode?

• To define fleet planning and explain why it is among an airline's most important long-term decisions
• To explain the objectives of fleet planning and its relationship with competitive strategy and marketing
• To list the stages of the economic evaluation process in fleet planning and calculate the required output and number of aircraft
• To explain the changes that affect fleet planning
• To explain the aircraft evaluation process and the technical, performance, engine and avionics reviews in this process
• To explain the advantages of fleet commonality, the features of used aircraft evaluation and the net present value approach in economic evaluation

Summary of this episode

1. Fleet and fleet planning

Definition (fleet): An airline's fleet is the total of aircraft of a single type or various types that have joined the fleet through purchase decisions made at different times.

Definition (fleet planning): It is the shaping of the changes that will take place in the fleet structure within a certain period (usually 5–15 years) within the framework of the airline's strategies.

Which questions does it answer? Which aircraft type will be acquired, when, and with which financial source and payment plan; which aircraft will be retired from the fleet, when and how.

Why is it so important? These decisions are among the airline's most important long-term decisions, because the purchase and operating costs of aircraft are very high. In the period in which the source was published, the list price of a 150-seat narrow-body aircraft started from 100 million dollars and went up to 400 million dollars for a 600-seat wide-body long-range aircraft.

Definition (economic life): It is the period during which the aircraft can be operated economically; according to the source, it is 15–30 years.

Which tools are used? Because of the uncertainty of the future and the many factors that cannot be controlled, airlines use basic decision support tools and financial models instead of detailed optimization models.

2. Objectives of fleet planning

Its place in the strategic plan: Fleet planning is not a strategy on its own; it is a sub-plan that feeds and is fed by the strategic plan, and it is renewed every year.

Main objectives:

• to determine the capacity, range, network suitability and economy of the required aircraft type,
• to determine how many aircraft of which type are needed and when, according to growth or downsizing plans,
• to foresee problems and opportunities in advance,
• to prepare a sustainable future for the airline,
• to create the flexibility to adapt quickly to changes,
• to anticipate strategic risks and plan resources on time in harmony with financial planning.

What does a wrong decision lead to? Choosing the wrong aircraft at the wrong time can make production expensive, inefficient or loss-making.

Relationship with competitive strategy: The fleet structure is the mirror of the competitive strategy. An airline flying a large and wide network with a differentiation strategy needs both narrow-body and wide-body, both short-range and long-range aircraft; an airline following a cost leadership strategy is expected to use a single type of narrow-body, short-range aircraft.

Relationship with marketing: Marketing also shapes the fleet. Example: An airline that decides to connect two cities 8,000 km apart directly has in fact decided that its fleet must include at least one long-range wide-body aircraft.

If frequency matters: If frequency is the most important determinant of demand, aircraft with fewer seats are preferred so as not to lower the load factor.

Information used: Demand forecasts and marketing research; questions such as geographical markets, regulations, competitive conditions and the need for frequency.

3. The economic evaluation process

The most important stage: It is forecasting future traffic demand as revenue passenger kilometers (RPK).

What is the forecast based on? It is made with scenarios based on factors such as national income, inflation, exchange rates, demographics, travel habits, regulations, technology and slot constraints; substitute transport options such as high-speed trains are also taken into account.

How is the required output found? The target load factor is set and the required output is calculated as available seat kilometers (ASK): Target output (ASK) = Traffic demand forecast (RPK) / Target load factor.

Definition (load factor): It is the ratio found by dividing RPK by ASK and multiplying by 100, showing how much of the offered capacity is sold.

How is the number of aircraft found? Aircraft productivity is measured by daily ASK per aircraft (number of departures × average stage length × number of seats); the total required output is divided by the annual output of one aircraft.

Example (fictional calculation): If an airline forecasts a demand of 1.6 billion RPK for next year and targets an 80% load factor, it must produce 2 billion ASK. If a 180-seat aircraft makes 4 flights a day with an average of 1,000 km, it produces 720,000 ASK a day and about 262.8 million ASK a year; in this case about 8 aircraft are needed.

Next stages: The required investment, purchase or leasing options, depreciation, interest and insurance expenses, the (non-operating) revenues expected from selling the aircraft that will leave the fleet, and operating costs are examined. With the revenue review, operating profit, net profit before and after tax and cash flows are estimated.

Comparison (two approaches): The review can be made with a broad "top-down" approach covering the whole network or with a narrow "bottom-up" approach that examines a specific airport pair in detail.

4. Changes that affect fleet planning

Competition: Competition increased by deregulation and liberalization has lowered unit revenues, made cost control more important than ever and increased the tendency toward aircraft with low fuel and maintenance costs.

Aircraft from the same family: The approach of using aircraft from the same family, which reduces maintenance and training costs, has become widespread.

Network structure: Hub-and-spoke networks have brought narrow-body aircraft to the fore to keep load factors while frequency increases, and large aircraft on busy routes between hubs.

Airport capacity: Capacity problems at busy airports can limit frequency increases and require the use of large aircraft.

Technology: Technological developments, composite materials and efficient engines have lowered costs.

Financing: Leasing has increasingly replaced purchasing. According to the source, while about 20% of the world fleet was acquired through leasing in 1984, this method was used in more than half of acquisitions in 2006.

Definition (operating lease): It is a lease made for short-term needs, in which ownership stays with the lessor.

Definition (finance lease): It is a lease that spans the economic life of the aircraft and in which ownership passes to the airline when the last rent is paid.

Environment: Environmental awareness has increased; ICAO's emission and noise standards and night restrictions at some airports have begun to affect fleet decisions.

5. Aircraft evaluation

Definition: Aircraft evaluation is the technical, operational and economic assessment made to choose the aircraft type that best meets the set criteria; it is more technical than fleet planning but indispensable.

Who does it? It is teamwork; the team includes at least maintenance and performance engineers, pilots and marketing specialists.

Two main reasons for acquiring aircraft:

• renewal of existing capacity (for reasons such as high operating costs, exceeding noise and emission limits, and decreasing economic life),
• capacity increase (growth in the existing network or a new mission such as starting long-range flights).

Data collected: The team brings together data on the network structure, routes, airports, existing fleet and product requirements.

Technical analysis: It compares the aircraft's structure, flight control systems, mechanical and engine systems in terms of safety, reliability and ease of maintenance.

Performance analysis: It looks at the aircraft's capability in phases such as takeoff, landing and cruise.

Definition (payload-range diagram): It is a performance tool that shows how far the aircraft can fly at different payload weights; as weight increases, range decreases.

Airport conditions: Runway length, elevation, slope, airport temperature and surrounding obstacles also affect performance.

Engine choice: When engine choice is possible, intense competition arises between manufacturers; what matters for the airline is fuel consumption and maintenance efficiency.

Definition (avionics): These are the aircraft's electronic flight, navigation and communication systems.

Why are options chosen carefully? Optional avionics and customizations increase certification costs and the price; in some wide-body models there are more than a hundred options even for the lavatory layout alone. That is why the benefit of each choice must be weighed against its cost.

Manufacturer support: The manufacturer's spare parts, training, technical support and warranty facilities are also evaluated.

6. Fleet commonality and used aircraft

Definition (fleet commonality): It is the closeness of the aircraft and engine types in the fleet to each other.

Advantages: Flexibility in aircraft assignment, crew scheduling and training, an efficient spare parts pool and easier assignment of maintenance teams.

Which fleet for whom? According to the source, three families (regional, narrow-body and wide-body) suit large airlines with wide networks; a single aircraft type suits low-cost airlines flying point to point.

Comparison (new and used): The purchase price of used aircraft is low; however, wear, increased weight and age can raise fuel and maintenance costs. New aircraft stand out in terms of passenger perception and ease of financing.

7. Economic evaluation

Basic principle: Acquisition and operating costs gain meaning together with the revenue the aircraft will generate over its economic life; the aircraft that provides the highest return after costs are deducted is chosen.

Costs compared: ownership, fuel, maintenance, airport and navigation, insurance and ground handling.

Real price: The real price of aircraft can differ from the list price through negotiation, engine competition and market conditions.

Definition (net present value; NPV): It is the evaluation criterion calculated by deducting operating expenses and investments in training, spare parts and ground equipment from the cash inflows expected over the aircraft's operation, and adding the scrap value at the end of the period. Internal rate of return analysis is also among the guiding methods.

Its limit: The accuracy of the results depends on the accuracy of the forecasts.

In short

Fleet planning is a long-term process that turns the airline's strategy into aircraft types and numbers. The required output and number of aircraft are found with the demand forecast and the load factor target; aircraft evaluation then chooses the most suitable type through technical, performance and economic reviews. The right fleet supports the airline's competitive strategy and keeps the flexibility to adapt to changes.

Key concepts

• Fleet: The total of aircraft of a single type or various types that have joined the fleet through purchase decisions made at different times.
• Fleet planning: The shaping of the changes that will take place in the fleet structure within a certain period within the framework of the airline's strategies.
• Economic life: The period during which the aircraft can be operated economically; according to the source, 15–30 years.
• Revenue passenger kilometers (RPK): The number of paying passengers multiplied by the distance flown.
• Available seat kilometers (ASK): The number of seats offered to the market multiplied by the distance flown.
• Load factor: The ratio found by dividing RPK by ASK and multiplying by 100, showing how much of the offered capacity is sold.
• Daily ASK per aircraft: Number of departures × average stage length × number of seats; the measure of aircraft productivity.
• Operating lease: A lease made for short-term needs, in which ownership stays with the lessor.
• Finance lease: A lease that spans the economic life of the aircraft and in which ownership passes to the airline when the last rent is paid.
• Aircraft evaluation: The technical, operational and economic assessment made to choose the aircraft type that best meets the set criteria.
• Payload-range diagram: A performance tool that shows how far the aircraft can fly at different payload weights.
• Avionics: The aircraft's electronic flight, navigation and communication systems.
• Fleet commonality: The closeness of the aircraft and engine types in the fleet to each other; provides flexibility in assignment, training, spare parts and maintenance.
• Net present value (NPV): The evaluation criterion calculated from the cash inflows, outflows, investments and scrap value expected over the aircraft's operation.

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Sources used:
Battal, Ü. (2016). Havayolu işletmelerinde filo ve tarife planlaması. E. Gerede ve A. E. Demirci (Ed.), Havayolu Yönetimi (6. Ünite) içinde. Eskişehir: Anadolu Üniversitesi Yayınları.

📚 Academic Use Note: This content is a supporting learning resource prepared with reference to a published course text; it does not replace textbooks, lecture notes or your instructor's teaching. The sources to be used for exams and assessments are your course's official curriculum and the sources recommended by your instructor. The simplifications and interpretations in the narration are for teaching purposes; TT Institute Academy cannot be held responsible for any consequences arising from possible errors, omissions or outdated information. The prices, rates and standards in this lesson belong to the period in which the source was published.

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