Side note about RR aircraft engines. Back when I worked at Boeing customers usually had a choice of three engine manufactures.
GE was the most expensive but also the most reliable and lowest maintenance cost.
Pratt Whitney was next in line. Think of these like a Toyota Camry.
Rolls Royce engines were shit. RR nearly had to give them away because otherwise nobody would use them. They made all the money servicing the engine and selling parts. Rolls Royce cars and Rolls Royce aircraft engines don't have the same standard of craftsmanship.
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