WORLD BRIEFLY Helicopter crew in collision with plane may not have heard key instruction from tower, NTSB says

WASHINGTON (AP) — The crew of the Army helicopter that collided in midair with an American Airlines jet near Washington, D.C.’s Ronald Reagan National Airport may have had inaccurate altitude readings in the moments before the crash, and also may not have heard key instructions from air traffic controllers to move behind the plane, investigators said Friday.