The National Transportation Safety Board is looking into flight data discrepancies, potential altimeter malfunctions and a possible miscommunication with air traffic control in the midair collision of an Army helicopter and a commercial airplane last month in the deadliest U.S. air crash in almost a quarter century.
“We are looking at the possibility of there may be bad data,” NTSB chair Jennifer Homendy said at a news conference on Friday. “We have a lot of work to do till we get to that.”
The Jan. 29 collision near Washington, D.C., that killed everyone aboard the plane and in the helicopter, 67 people in all, has prompted fears of flying in the busy airspace above the nation’s capital, which transports roughly 25 million people...