Here’s yet another problem with engines that Airbus and Boeing face. The world’s airlines can’t be happy with these production delays. It is aviation’s version of the butterfly effect. A single jet-engine part small enough to fit in the palm of your hand has worsened factory delays that are rippling from Boeing Co. and Airbus SE to maintenance shops around the globe, according to interviews with more than 20 people conducted by Bloomberg.
Collected and summarized from the source below by Quynh Hoa https://skift.com/2018/09/12/boeing-and-airbus-struggle-to-deliver-new-planes-because-of-engine-issues/