Yes, United Airlines (along with American Airlines) faced extensive litigation following the terrorist attacks of September 11, 2001. While the vast majority of victims' families chose to receive compensation from the government-funded "September 11th Victim Compensation Fund"—which required them to waive their right to sue—96 families opted out to pursue legal action against the airlines and security companies. These lawsuits centered on allegations of security lapses, faulty cockpit doors, and inadequate training. One of the most prominent cases, Bavis v. United Airlines, was only settled in 2011, nearly a decade after the attacks. Additionally, property developers like Larry Silverstein sued the airlines for billions in damages to the World Trade Center complex. In 2017, a final major settlement of $95.1 million was reached between the airlines and the World Trade Center developers, effectively concluding over 13 years of civil litigation related to the security failures that allowed the hijackings to occur.