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# What Is RASK in Airline Economics?
- URL: https://www.acmiworld.com/what-is-rask-in-aviation/
- Published: 2026-09-14T16:35:43.000Z
- Updated: 2026-09-14T16:35:43.000Z
- Description: RASK defined for aviation professionals, with its operational or commercial use, document context and related terminology.
- Author: ACMI World
- Tags: Aviation Glossary, Airline Economics & Scheduling, #Import 2026-09-14 15:41

## Technical Meaning and Practical Use

Revenue per Available Seat Kilometre, or RASK, divides airline operating revenue by available seat kilometres.

Aviation Glossary

**Term:** RASK

**Category:** Airline Economics & Scheduling

## What the Number Can Show

Comparing RASK with CASK helps show whether unit revenue is sufficient to cover the airline's unit cost base.

## How Airlines Use the Metric

RASK is used to describe capacity, traffic, cost, revenue, schedule performance or asset productivity. It is most useful when the calculation basis is consistent across the periods, airlines or fleets being compared.

## Comparison Limits

Airline metrics can be distorted by stage length, fleet mix, geography, accounting treatment, seasonality and business model. A single ratio should therefore be read with the operating context and the underlying numerator and denominator.

## Related Aviation Topics

Related ACMI World coverage includes [ACMI lease pricing](https://www.acmiworld.com/acmi-lease-pricing-explained-what-airlines-actually-pay-for-capacity/), [seasonal ACMI demand](https://www.acmiworld.com/seasonal-demand-and-acmi-leasing/), [the 2026 capacity environment](https://www.acmiworld.com/why-airlines-are-turning-to-acmi-in-2026-gtf-groundings-delivery-delays-and-the-capacity-crunch/), [aircraft lease rates by model](https://www.acmiworld.com/aircraft-lease-rates-by-model-in-2026/) and [leading ACMI operators](https://www.acmiworld.com/top-20-acmi-operators-in-the-world-2026-rankings/).

Comparing RASK with CASK helps show whether unit revenue is sufficient to cover the airline's unit cost base.

Frequently Asked Questions

## RASK FAQ

What does RASK mean in aviation?

Revenue per Available Seat Kilometre, or RASK, divides airline operating revenue by available seat kilometres.

Why does RASK matter?

Comparing RASK with CASK helps show whether unit revenue is sufficient to cover the airline's unit cost base.

Where would an aviation professional encounter RASK?

It is commonly encountered in airline economics & scheduling documents, procedures, calculations or operating discussions where the underlying technical or commercial issue is relevant.

Can the metric be compared directly between airlines?

Only when the calculation basis and operating context are sufficiently comparable. Stage length, fleet mix, geography and accounting policy can materially change the result.