The moments before a helicopter and plane collided mid-air over the Potomac River

A regional jet departed Kansas and headed to one of the country’s most congested and complicated flight approaches, just south of the brightly illuminated marble monuments of Washington, DC. The journey ended as the deadliest US aviation disaster in nearly a quarter century.

​ A regional jet departed Kansas and headed to one of the country’s most congested and complicated flight approaches, just south of the brightly illuminated marble monuments of Washington, DC. The journey ended as the deadliest US aviation disaster in nearly a quarter century. Read More Breaking News, Latest News and Videos | CNN