An air traffic controller failed to notify the crew of a commercial plane that an Army helicopter was moving toward the aircraft before the collision in Washington, D.C., in January that killed 67 people, a Federal Aviation Administration official said on Thursday.The FAA's first acknowledgment of a possible error in the control tower at Ronald Reagan National Airport just before the fatal collision came on the second day of National Transportation Safety Board hearings looking into what led to the midair crash.Officials testified at the hearing about a high number of takeoffs and landings at the airport that, in addition





























