Out of interest, would Boeing cover the cost of this?
Boeing will face massive compensation claims from airlines affected so ultimately they will pick up the bill for sure. No doubt Boeing will have some major insurance in place for this type of event as part of their business cover but bound to hit the company earnings to some degree. I wouldn't like to guess the figure but it will grow the longer the planes are grounded and now the impact of slower deliveries when the issue is fixed ( At the weekend they announced a reduction in production levels as a result)

