'This airplane is designed by clowns':Boeing employees KNEW about 737 Max issues

Just a heads up - the Daily Mail are not a reliable source of news. (for example: Wikipedia have had to ban them from citations due to "the Daily Mail’s reputation for poor fact checking, sensationalism and flat-out fabrication".)

Whilst this specific report is echoed in other news sources, and therefore probably accurate, I'd avoid using the Daily Mail as a primary source of information.