...- Boeing's cash flows for the next two years are going to be much weaker than we had expected, due to the 737 MAX grounding, resulting in worse credit ratios than we had forecast. - In addition, the significant reduction in global air travel due to the coronavirus will likely result in an increase in aircraft order deferrals, further pressuring cash flows. - We are lowering our issuer credit and unsecured debt ratings on the aircraft manufacturer and weapons producer to '###' from 'A-'. The ratings remain on CreditWatch, where they were placed with negative implications on Jan. 23, 2020. - We are affirming the 'A-2' short-term rating and placing it on CreditWatch with negative implications. - The CreditWatch placements reflect that we could lower the ratings further if cash flow over the next 12-24 months is weaker than we expect due to further delays in MAX certification, fewer MAX deliveries, higher costs to compensate customers or suppliers, lower cash flow from the rest of the business,...