Divers are expected to return to the Potomac River as part of the recovery and investigation after the United States' deadliest aviation disaster in almost a quarter century.

Questions remain over the mid-air collision between a jet, which was carrying 64 people, including the crew, and a military helicopter carrying three soldiers

There have been a number of close calls around the country in recent years that concerned aviation experts and officials.

How rare are deadly mid-air collisions in the U.S.? According to the FAA, this is the first major fatal crash of any U.S. airline in 16 years. “Based on historical review, I was shocked,” David Cadden,