The U.S. government admitted in a court filing that actions by an air traffic controller and Army helicopter pilots helped cause the midair collision that killed 67 people near Reagan National Airport, after months of investigation following the crash.The filing says the United States "owed a duty of care to plaintiffs, which it breached," while also noting others, including the jet’s pilots and the carriers, may have contributed and simultaneously denying individual negligence by controllers or officials.Investigators found the Black Hawk was about 78 feet above the permitted route altitude, that its barometric altimeter underreported altitude by roughly 80 to 100 feet, and the NTSB recorded about 85 near‑misses before the accident; families are pursuing civil claims as the FAA has tightened helicopter rules and the Senate passed the ROTOR Act, with the NTSB report expected next month.