90s 70s 3.25m 2.6m Boeing 777 Boeing 747 GE90 JT9D-7A Trent 800 RB211-524B2 777 engine is 10%lighter yet 25%powerful than 747 engineBoeing 777 Boeing 747 3.25m 2.6m 777 engine is 10% lighter yet 25% powerful than 747 engine 90s 70s GE90 Trent 800 JT9D-7A RB211-524B2