In pictures: Fatal collision between jet and helicopter near Washington, DC

A large-scale search operation is underway following a midair collision between an American Airlines passenger jet and a US Army Black Hawk helicopter near Reagan National Airport, just outside Washington, DC.

​ A large-scale search operation is underway following a midair collision between an American Airlines passenger jet and a US Army Black Hawk helicopter near Reagan National Airport, just outside Washington, DC. Read More Breaking News, Latest News and Videos | CNN