United Airlines Holdings, Inc. (NASDAQ:UAL) shares are trading higher on Thursday. The company unveiled its largest international expansion, adding service to eight new cities. Beginning in May 2025, the airline plans to launch five new nonstop flights from its Newark/New York hub to destinations not served by other U.S. airlines. This includes Bilbao, Spain; Nuuk, Greenland; Madeira Island, Portugal; Faro, Portugal; and Palermo, Italy. Apart from this, United Airlines is introducing three new nonstop routes from Washington D.C./Dulles, which features its inaugural year-round flight to Dakar, …