David Muir reports from the Vatican after the historic election of the first American pope. Less than 24 hours after being introduced, Leo XIV entered the Sistine Chapel to celebrate his first mass and spent time with the faithful, giving out blessings; Terry Moran reports on what the other American cardinals say happened inside the conclave that made history; Gio Benitez has the latest after radar screens went black again at Newark Liberty Airport for about 90 seconds on Friday. Just last week a similar radar outage forced the airport to cancel and delay thousands of flights, and more on tonight's broadcast of World News Tonight with David Muir. 

The FAA taking action to slow flights at Newark airport after yet another equipment failure, Ike Ejiochi has the latest; Jay O'Brien reports on Hamas saying it will release the last remaining American hostage, Edan Alexander; After high-stakes negotiations, Selena Wangs reports on the U.S. and China saying substantial progress has been made; James Longman reports from Vatican City as Pope Leo XIV makes his first Sunday address; America Strong celebrating mothers who make it all happen; and more on tonight's broadcast of World News Tonight.