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The first phase of an audit by the Federal Aviation Administration shows that airlines are 99 percent compliant with mandatory air-worthiness directives, the agency's acting administrator said Wednesday.

Four U.S. airlines are under investigation for failing to comply with federal aviation regulations, Robert Sturgell said.

"The special audit that began March 13 showed us that the system we have in place is effective," he said at Reagan National Airport. Read full article »

All About Federal Aviation AdministrationSouthwest Airlines Inc.

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