 And one, just to narrow down on one specific, one very fundamental change that had been made was that the designers who worked in the simulator with customers had been moved to Miami, partly in a cost dispute with the pilots in Seattle. And so those people were not working closely with the test pilots who were looking at what was happening in the MAX during test flights and discovered this late squawk, as they called it, with MCAS, which was the system implicated in the crashes.