An important protection against a midair crash is technology known as a traffic collision avoidance system, or TCAS. The system, which is required on passenger airlines, alerts pilots when two ...

D.C., has led to many questions about the role played by the Traffic Collision Avoidance System, or TCAS. While you can read our report of the incident here, it should be restated that, at this early ...

US time, a passenger jet and US Army helicopter collided at a low altitude near Ronald Reagan Washington National Airport, ...