B737 MAX - Come back in Six Years
I had a bloke working for me who had been a project manager at the Mini plant of BMW. He told me if they wanted to change a panel on a production vehicle, from the time they started designing it on the CAD machines to the time it went into production, was... one week.
Boeing are going to take an existing model, on an existing production line and swap in an engine that exists now more-or-less, and they are going to take not one week but THREE HUNDRED!
There must be a better way of building aeroplanes.