Definition of Air crash investigations

Mayday (also known as Air Emergency in the United States, and Air Crash Investigation in other parts of the world) is a documentary television program produced by Cineflix in Canada. It is aired on Discovery Channel Canada and the National Geographic Channel. As of February 2007, 4 seasons of programs have been produced. Two episodes were produced in 2005 and one in 2006 detailing non-aircraft disasters, these are titled Crash Scene Investigation non-Mayday countries.