GEnx - Boeing 787 and Boeing 747-8 Aircraft Engine. GEnx-1B Boeing 787 engine, GEnx -2B Boeing 747-8 engine, GEnx Aircraft Engine, GEnx GE aviation Aircraft Engine. GEnx-2B Boeing 747-8 Aircraft engine Assembly Timelapse video. The GEnx is the fastest-selling jet engine in the world. It's a high-thrust jet engine manufactured by GE Aviation. GEnx-1B powers Boeing 787 Dreamliner and GEnx-2B powers four-engine Boeing 747-8.