A Washington, D.C.-area helicopter pilot says Army Black Hawk was flying published route and on appropriate radio frequency.

An American Airlines passenger plane collided with a Blackhawk military helicopter, with two pilots discussing a fireball on ...

Above: An aircraft-mounted, two-axis scanner for a Doppler lidar to study complex wind patterns found around wildfires in complex terrain or near the coast. Top Image: Team members from left to right: ...