Alaska Airlines has again grounded all of its Boeing 737 Max 9 jetliners. The airline said on Sunday that the Federal Aviation Administration has indicated further maintenance might be required. The FAA had ordered that all 737 Max 9s be grounded after an Alaska Airlines flight had a portion of its fuselage blow out over Oregon on Friday night. The plane landed safely with no serious injuries. Alaska had returned 18 of its 65 737 Max 9s to service Saturday after they passed inspection. The aircraft make up about 20% of Alaska's fleet. About 170 of the aircraft are in service worldwide. Other versions of the 737 are not affected.
