The Army helicopter and regional American Airlines jet that collided over Washington are both workhorse aircraft that operate around the world on a daily basis.

There were 60 passengers and four crew members on the jet, a Bombardier CRJ-700, officials said. Three service members were on a training flight on the UH-60 Black Hawk helicopter. None are believed to have survived the Wednesday night collision, which caused both aircraft to plunge into the frigid Potomac River.