Investigators are seeking clues into the deadly midair collision earlier this week that now stands as the deadliest aviation disaster in the U.S. almost a quarter century.
The collision between an American Airlines passenger jet and an Army helicopter at Ronald Reagan Washington National Airport near Washington, D.C, late Wednesday killed 67 people, including more than a dozen figure skaters. More than 40 bodies have been recovered.
Air crash investigations can take months - or longer. Investigators have declined to publicly speculate on the cause of the collision.