来源：央视新闻客户端 当地时间12日，美国联邦航空管理局称洛杉矶国际机场因设备故障，航班停飞。 ...

Group 1 - United Airlines experienced a technical failure leading to the grounding of mainline flights at several major airports in the U.S. [1][2] - The airline reported that 827 flights were delayed and 23 flights were canceled due to the technical issues [2] - The stock price of United Airlines fell from an increase of 1.22% to a decrease of 0.84% during after-hours trading [1] Group 2 - A recent incident involved a United Airlines Boeing 787 aircraft that experienced engine failure shortly after takeoff, prompting a Mayday call [2][3] - The aircraft was carrying 219 passengers and 11 crew members, and the flight had to circle for over 30 minutes to burn off fuel before landing safely [3] - United Airlines has faced multiple technical issues recently, contributing to a year-to-date stock price decline of over 8%, underperforming compared to major U.S. indices [1] Group 3 - Boeing's defense division is facing potential shutdowns due to a strike by assembly workers, affecting the production of military aircraft [4] - The strike is primarily due to failed negotiations over worker compensation, impacting the assembly of F-15, F/A-18, and T-7 aircraft [4] - Boeing reported a revenue improvement in Q2, with a 35% year-over-year increase, but still incurred a loss of $612 million [5]