and measure altitude above sea level using atmospheric pressure. Modern commercial aircraft use electronic altimeters for ...

This data point is one of several key mysteries investigators are exploring as they seek to explain what caused the nation's ...

In the days following the deadly midair collision between a Black Hawk helicopter and an American Airlines flight near Reagan National Airport, Col. Tim Zerbe, the State Army Aviation Officer at ...

Victims' families gathered near the site where a plane and copter collided and fell into the Potomac River. 'They are all ...