You are right that Airbus had a hard time figuring out which plane to make, rushing a couple of A350 concepts before settling on the so called A350-XWB. But on

You are right that Airbus had a hard time figuring out which plane to make, rushing a couple of A350 concepts before settling on the so called A350-XWB. But once it was settled the engineering went smoothly. Or, should I say, has been going smoothly so far. The skills involved in designing a plane are vastly different from that of figuring out which plane your customers will want 5 to 30 years from now.