From the Associated Press:
A Transportation Department investigation has concluded that Federal Aviation Administration officials covered up safety errors at Dallas-Fort Worth International Airport, the second such admonishment in the past three years. [..]
[The U.S. Office of Special Counsel found] that between November 2005 and July 2007 FAA managers intentionally misclassified 62 instances in which airplanes were allowed to fly closer together than they were supposed to, attributing the errors to pilots or categorizing them as nonevents in an attempt to shift blame away from air traffic controllers at the Texas airport.
More here.
