[fbd_0100]

Agree on most points. However as someone who has worked on new aircraft I can tell you that friction/mis-communication/finger-pointing between airframe and powerplant manufacturer is a huge issue. There is a common saying in the industry, that you should never design a new airframe and a new powerplant at the same time. Each new aircraft certification program should be one or the other

[class3shock]

Sure, as there is when any two companies work together but to say they have no ability to communicate performance parameters, that they have no ability to work together, is just wrong.