The U.S. aviation regulator on Friday extended the grounding of Boeing 737 MAX 9 airplanes indefinitely and announced it will tighten oversight of Boeing itself after a cabin panel broke off a new jet in mid-flight. As United Airlines and Alaska Airlines canceled flights through Tuesday, the Federal Aviation Administration also said it will require another round of inspections before it will consider putting the jets back in service.
UPDATE 6-US regulator grounds Boeing MAX 9 indefinitely, flights canceled to Tuesday
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