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I agree, on the one had this is normal, there are issues discovered and corrected during testing of all new aircraft types.

But I also wonder if we aren't pushing the limits of what's reasonable for a 2-engine passenger airliner. I get that the more people you can put on a flight the more money the airlines make from that flight, but there's a practical limit somewhere.

we're still making huge leaps forward in the quality of the base materials, until we stop making progress there, I don't think we're able to say that we're at the practical limit.

It's on the backdrop of the 777X being delayed like 4 times so far.

Uh, no. It's not "normal" to find structural failures on your engine mounts on 3 different aircrafts during testing stages.

That points to major structural issues. Or better said, yet an other structural issue on an aircraft type that is already 5 years late.