The problem most of you don't see is that professional sound capturing for a business project costs sh*tloads of money. First you need to have the sound equipment (which isn't cheap to begin with), then you need people who own the original engines and are willing to run them in the capturing setup across the whole performance band (which is unlikely today due to the rarity of these engines) and then you need to get your people to the aircraft in question (which are, inconveniently, spread across the globe) ... All of that will surely cost a 6-digit sum which is probably the same amount of money which using other people's sound samples will cost.
It's not just a question of getting "better" sound samples. It's all about logistics and money ...
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