最新！美国航司巨头多个航班被下令停飞，发生了什么？

Group 1 - The Federal Aviation Administration (FAA) issued a ground stop order for United Airlines due to a technical failure affecting multiple airports [1][3] - The technical issue impacted all flights, with 827 flights delayed and 23 flights canceled, while flights already in the air continued to their destinations [3] - Recent incidents involving United Airlines include a serious engine failure on July 25, where a flight had to declare an emergency shortly after takeoff [4][5] Group 2 - The affected airports include major hubs such as Denver, Houston, Newark, San Francisco, and Chicago [3] - The airline is working to restore its systems, but passengers may experience delays throughout the night [3] - The July 25 incident involved a Boeing 787 aircraft that had to circle for over 30 minutes to reduce weight before safely landing [5]