WASHINGTON: The Trump administration has asked Congress to approve an additional US$19 billion to fully modernise the United States' ageing air traffic control system, bringing the total cost of the overhaul to US$31.5 billion. US Transportation Secretary Sean Duffy made the request on Wednesday (July 16) at a House Transportation and Infrastructure Committee hearing, where he said the administration had the support of airlines and other aviation stakeholders. "We are going to need more money