Related Why The Boeing 777-300ER Is So Reliable Excellent Boeing engineering, good engines, and sustained investment all played a key role. In 1999, Boeing and GE Aerospace made a landmark deal that they would exclusively see the Boeing 777-300ER and 777-200ER powered by variants of the GE90 engine. The Next Chapter: 777XCredit: ShutterstockThe Boeing 777X is a long-anticipated successor to the iconic Boeing 777, or 'Triple Seven' family. The Boeing 777X not only features a dramatically improved cabin, fuel-saving and performance improvements, but also a much better maintenance interval with reduced cost and less frequent needs. Emirates alone has anchored its entire future fleet strategy around the type, with an enormous backlog of over 170 Boeing 777X aircraft on order.