 and of course, chaos at airports. NPR's Bobby Allen reporting. The tracking site FlightAware.com says more than 1,500 flights have been delayed in the U.S., but worldwide, more than 19,000 flights have been delayed. Former President Donald Trump has formally accepted the 2024 Republican presidential nomination. As NPR's Ximena Bustillo reports, Trump's acceptance speech in Milwaukee last night wrapped up this year's GOP convention. Trump spoke