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“Improved causality data and ongoing schedule monitoring are useful for identifying systemic delays, but there will likely be diminishing opportunities for further reducing chronic delays until significant NextGen capacity enhancements begin to come online,” said Brodi Fontenot, assistant secretary for administration at the FAA.

As for the safety system, the FAA acknowledged that its hands are tied to some extent by the confidentiality agreements, but H. Clayton Foushee, director of the FAA’s office of audit and evaluation, said the secrecy is needed in order to get airlines to turn over information.

Even with those limitations, the system has helped officials adopt 16 major safety initiatives, Mr. Foushee wrote. He said officials are taking steps to try to get more data out the door.

“Over the next two years, the FAA will implement new initiatives to improve the communication of ASIAS identified risk factors with the inspector workforce. These new initiatives will provide actionable information that will enable FAA inspectors to focus their surveillance activities on higher priority risk areas,” Mr. Foushee wrote.