Boeing's 787, 747-8 and 737 MAX wear jagged exhaust edges called chevrons. They smooth the mixing of hot and cool air streams, cutting low-frequency jet noise. The trade-off is permanent: a small aerodynamic penalty every flight. Boeing's newest widebody engine,…

The most powerful commercial jet engine in widespread service is the GE90-115B, certified at 115,540 lbf of takeoff thrust on the Boeing 777-300ER. The GE9X holds the all-time test record, but its certified takeoff rating is lower, and no 777X…

The 777X enters service with smooth, chevron-free nacelles—the first clean departure from Boeing's serrated trailing edges since the chevron debuted on the 787 and 747-8. Internal acoustic engineering now does the noise-suppression work: a roughly 10:1 bypass ratio, 16 carbon-fiber…