An aerospace engineering firm is evaluating the fuel efficiency of two newly developed sustainable aviation fuels (SAF-Alpha and SAF-Beta) for short-haul commercial flights. To ensure a fair test, the firm matches pairs of twin-engine aircraft based on airframe age, engine model, and typical flight route. One aircraft in each pair is fueled with SAF-Alpha, while the other is fueled with SAF-Beta. The average fuel consumption (in kilograms per passenger-kilometre) is recorded over a series of test flights.
Explain what is meant by a matched pairs design.
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