Air traffic control managers told the National Transportation Safety Board that F.A.A. leaders rebuffed efforts over the years to address hazardous conditions that played a role in the Jan. 29 crash.

The National Transportation Safety Board also released a trove of documents related to the fatal midair collision in January between an Army helicopter and a regional jet at…

Air traffic control managers told the National Transportation Safety Board that F.A.A. leaders rebuffed efforts over the years to address hazardous conditions that played a role…

The F.A.A. has since been training on-call specialists to be snappier about administering alcohol and drug tests after a serious incident, an official said.