United Airlines experienced a temporary disruption to its operations center at its headquarters due to a fire alarm issue on Friday, July 26th. Remote employees maintained fleet operations during the brief evacuation, according to a statement refuting earlier reports of the entire U.S. fleet being grounded. The operations center employees were able to return to the building, allowing normal operations to resume. Earlier reports, circulating on social media, claimed the entire United States fleet was grounded, sparking fears of widespread travel chaos. These reports have been officially denied by United Airlines. Separately, in Kansas City, Kansas, rescue crews were working to reach a construction worker buried in a 25-foot trench with unstable soil on Friday. The situation was being monitored by Citizen. Beloved Grammy-winning American jazz icon Chuck Mangione has died at the age of 84. Mangione was widely known for his 1977 album "Feels So Good" and its title track, which achieved widespread popularity. ABC News plans to look back on his life and legacy.