President Trump’s nominee to lead the Federal Aviation Administration was grilled by senators Wednesday on critical safety-related issues, including the required hours needed for pilots, the outdated air traffic control system and the ongoing problems at Ronald Reagan Washington National Airport.

U.S. Transportation Secretary Sean Duffy pushes for over $20 billion funding in Trump's budget for modernizing air traffic control. Challenges include outdated technology and safety issues prompting airlines and aerospace companies to seek $31 billion.

The FAA is set to overhaul its ancient air traffic control systems that still uses a combination of Windows 95, floppy disks, and paper cards.