Airline cases: sell the seat and price the flight

Follow the journey from timetable to flown passenger

An airline commits aircraft, crews and airport access to a timetable, sells travel through its own channels or intermediaries, then operates and supports the journey. For a case, sketch those activities before requesting data: network planning, selling, ground handling, flying and maintenance. Ask whether the business sells individual seats, whole-aircraft charters, cargo capacity or a combination. A connecting passenger can use two flight segments while buying one itinerary.

Airline revenue can extend beyond the base ticket. Delta's FY2025 filing separates passenger, cargo and other revenue and describes loyalty arrangements. Use those disclosed streams to understand that business, then check which ones the case includes. Read Delta's revenue discussion.

State the unit of analysis: a flight segment, route, itinerary or entire network. A route decision can affect connecting revenue elsewhere, so a profitable-looking stand-alone segment may still be the wrong network comparison.

Separate passenger costs from departure costs

For a simple route model, passengers equal departures multiplied by seats per departure and the occupied share. Passenger revenue equals passengers multiplied by average collected fare; add ancillary revenue only where it is excluded from that fare. Keep taxes collected for others outside revenue if the exhibit does so.

Some costs change with another passenger, some with another departure and some only when the fleet or network changes. Delta reports salaries, aircraft fuel, maintenance and landing costs among its operating expenses. Its accounts illustrate relevant cost categories; the avoidability of each cost remains a case-specific question. Check the operating-expense discussion.

A lease payment may stay after one route closes. Fuel for a cancelled flight may disappear, while crew savings depend on the contract and redeployment. Ask which cost changes within the decision period. An allocated share of head-office cost does not establish a cash saving.

Use compatible distance and revenue denominators

The US Bureau of Transportation Statistics defines revenue passenger-miles (RPM) as paying passengers multiplied by miles travelled, and load factor as RPM divided by available seat-miles (ASM). ASM measures offered seat-distance. See the BTS definitions.

• Load factor (%): RPM ÷ ASM. A passenger-weighted average across unequal distances can give a different answer.
• Passenger yield (cents per RPM): passenger revenue ÷ RPM, converted from dollars to cents.
• Passenger unit revenue (cents per ASM): 100 × passenger revenue in dollars ÷ ASM. With consistent scope, this equals yield multiplied by load factor as a decimal.
• Cost per ASM: the specified operating cost ÷ ASM. Check exclusions before comparing carriers or periods.

Seats and aircraft are capacity stocks; flown passenger-miles are period flows. A fleet count alone cannot tell you annual sellable capacity without utilisation, seating and distance assumptions. Higher occupancy can accompany lower contribution when discounts reduce the margin on existing customers.

Try a fare and frequency decision

Practice figures. A route uses 150-seat aircraft on equal 600-mile segments. Management compares the following monthly alternatives. Passenger cost is $20 per traveller; ancillary revenue is $20 per traveller. Each operated departure costs $11,000 in addition to passenger costs. Shared overhead is unchanged.

The fare cut applies to every passenger. Extra flights bring 1,000 genuinely additional passengers, with no displacement from current departures. Their full incremental departure cost is included in the $11,000 rate; no further aircraft investment is required in this model.

Question: Which alternative improves monthly route contribution after departure costs? Calculate the extra-flight break-even passenger count before recommending it.

Turn the model into a useful investigation

Pricing questions need evidence on incremental demand, discounted existing passengers and seat availability on the specific departures. Frequency questions need aircraft, crew and airport feasibility as well as demand. Closure questions need avoidable costs and lost connecting contribution. For reliability work, compare cancellations and delays using the stated scheduled-flight denominator.

Request the smallest exhibit that distinguishes those explanations: a route-by-period contribution bridge, departure-level occupancy or a fare-segment mix. Keep the recommendation tied to the objective and time horizon. Name the assumption that would reverse it, such as fewer than 917 incremental passengers in the practice example.