US Transportation Secretary Sean Duffy is pressing Congress to fund a $30 billion overhaul of the national air traffic control system, a proposal that would replace aging infrastructure at the heart of American airspace management.

The request puts a concrete price tag on what regulators and industry groups have described for years as a system running on outdated equipment. Duffy is asking lawmakers to authorize the multi-billion-dollar program to modernize facilities, communications equipment and surveillance technology used by controllers across the Federal Aviation Administration's network.

The scale of the request — $30 billion — signals an acknowledgment within the Department of Transportation that incremental upgrades will no longer keep pace with traffic growth or the technical demands of modern airspace operations. Air traffic control hardware in the United States still includes components dating back decades, and controllers at some facilities continue to work with paper flight strips and radio systems that predate the industries they serve.

For airlines, the stakes are operational and financial. Capacity constraints at major hubs, flight delays and ground stops tied to controller staffing and equipment failures translate directly into lost block hours and schedule disruption. A modernization program of this size would carry consequences for network planning at every major US carrier, from American and Delta to Southwest and United, if it delivers improved throughput and reliability at congested facilities.

The proposal now sits with Congress, where funding for FAA infrastructure has historically moved slowly and often in piecemeal appropriations. Duffy's push for a single, comprehensive authorization represents an effort to lock in a sustained funding stream rather than depend on annual budget cycles that have left previous modernization initiatives underfunded or stalled.

What remains undefined in the secretary's appeal is the delivery timeline. A program of this magnitude — covering equipment procurement, facility construction and workforce expansion — would unfold over years, and the gap between authorization and operational capability will determine whether airlines see near-term relief or a long-horizon investment.

Duffy's proposal follows increased scrutiny of the air traffic control system after high-profile incidents raised questions about equipment reliability and controller staffing levels. Industry groups and airline executives have repeatedly called for sustained federal investment, arguing that the current system constrains the recovery of capacity to pre-pandemic levels at key airports.

The $30 billion figure will now be tested against congressional appetite for transportation spending and against competing priorities in the federal budget. Lawmakers have not yet scheduled consideration of the request.

If Congress authorizes the funding, the FAA would face the execution challenge: procuring and deploying new systems across hundreds of facilities without interrupting daily operations that handle tens of thousands of flights. How the agency sequences that work, and whether Duffy can hold the program to a defined schedule, will determine whether the overhaul becomes a capacity unlock for US aviation or another multi-decade procurement cycle.