How the Boeing 737 MAX, 747-8, & 787 Dreamliner's engines create problems no other modern jet faces

Designed to reduce noise, nacelle chevrons ultimately proved to be more bad than good.
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Why does the Boeing 747-400 have 3 engine types?

The Boeing 747-400, introduced in the late 1980s, represented a significant evolution of the iconic 747, featuring improved aerodynamics, advanced avionics, and substantially improved fuel efficiency.