U.S. Department of Transportation

Shortly after a federal judge struck down the Centers for Disease Control's mask mandate for public transportation, all major airlines at Kansas City International Airport announced they would drop their mask requirements.

Delta, United, Southwest, American and Alaska Airlines and other say masks are now optional for travelers on their aircraft.

Buttigieg visited Kansas City, Kansas, on Friday to discuss how the $1 trillion bipartisan infrastructure bill will modernize infrastructure across the U.S.