The carrier , the world's largest low-cost carrier, announced grounding 128 planes on Tuesday because the planes had not be adequately inspected. Following the airline's actions, the  ruled grounding of the planes is not mandatory provided inspections are completed within five days.
The US carrier Southwest Airlines , the world's largest low-cost carrier, announced grounding 128 planes on Tuesday because the planes had not be adequately inspected. Following the airline's actions, the Federal Aviation Administration ruled grounding of the planes is not mandatory provided inspections are completed within five days.
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carrier
US carrier Southwest Airlines
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Federal Aviation Administration