During a portion of an interview aired on Tuesday's "NBC Nightly News," Transportation Secretary Pete Buttigieg said, "There are going to be challenges" with air travel over the July 4 holiday, and that despite receiving $50 billion in coronavirus relief designed to save jobs, "a lot of people, including pilots, were nudged into early retirement by the airlines. That certainly is something that reduced the labor force that, right now, we're really counting on."