An anonymous reader writes "NASA released part of a controversial study about air traffic safety Monday. The space agency spent $11 million on a survey of airline pilots. Agency officials were so disturbed by the findings that they intended to destroy the information rather than release it. But at an October congressional hearing, NASA administrator Michael Griffin changed tack and said the agency would release its findings. The research shows that safety problems occur far more often than previously recognized. NASA has been criticized however for not providing 'documentation on how to use its data, nor did it provide keys to unlock the cryptic codes used in the dataset.'"