http://www.airplanessale.info/boeing-777-rolls-royce/
Why do they have different types of engines for the same aircraft?
For example, how come some Boeing 777′s have engines made by GE, while others have engines made by Rolls Royce? What difference does it make?
It depends on the goals and mission of the airline. In the US you won’t see a 777 making any short trips, they are reserved for the very long flights. In Asia many airlines operate large aircraft over short distances, They find this to be a viable way of flying the airplane; they have more people needing to go short distances.
Different engines are different for a reason. Some make more thrust, some are more efficient. The engine can be matched to the needs of the airline.
Other considerations figure into the decision also, like noise, availability of parts, price, etc.
London-Heathrow Landing: American Airlines Boeing 777-200ER (Rolls Royce Trent)
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