The Lockheed L-1011 TriStar was a wide-body trijet airliner introduced in the early 1970s, and like other jets of its era it used a Ground Proximity Warning System to alert crews to dangerous descents. The pull up callout became one of the most recognised cockpit warnings in aviation, later familiar to wider audiences through flight simulators, documentaries, and cockpit recordings shared online. Aviation fans preserve specific aircraft variants of the alert, and editors reuse this TriStar version for its clear, period-correct synthetic voice.