"A six-month examination of more than 150,000 reports filed by pilots and others in the aviation industry over the past 20 years reveals surprising and sometimes shocking safety breaches and close calls at local, regional and major airports throughout the country." The investigation was a collaboration between members of the Investigative News Network and National Public Radio. The NPR report can be heard here. Data for this project was provided by the National Institute of Computer-Assisted Reporting (NICAR).
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