OSHKOSH — U.S. Transportation Secretary Sean Duffy says a major overhaul of the nation's air traffic control system has started with increased enrollment in the FAA's air traffic controller classes.

Here’s what to know about him. He was an MTV reality star When Duffy was in his 20s, he appeared on MTV’s reality show “The Real World” and became known as the show’s resident playboy.

Overhaul of nation's air traffic control system has started with training of controllers, Transportation Secretary Sean Duffy ...