Testifying for the first time in front of the Senate Subcommittee on Aviation, acting Federal Aviation Administrator Chris Rocheleau admitted that "something was missed."

The agency said it’s taking steps to lessen the risk of collisions, but lawmakers say too many gaps remain — and place part of the blame on the military.

The head of the Federal Aviation Administration has told Congress that the agency must do more to ensure flying remains safe after a midair collision over Washington, D