The ban had been challenged by the U.S. Chamber of Commerce as well as the Associated Builders and Contractors, which hailed the judge's decision as a victory.
Chiefs of Laborers and Electrical Workers unions addressed delegates in Chicago as Democrats released their party platform that emphasized infrastructure funding priorities.
The expanded King Salman International Airport would cover 22 sq miles and include six parallel runways. Saudi officials say the airport would be able to accommodate 100 million passengers by 2030.