LOS ANGELES (AP) — A massive new $1.73 billion concourse with 15 gates opened Monday at Los Angeles International Airport.

Known as West Gates, it will serve both international and domestic flights.

“This is a big day in a big city that’s building out a big new infrastructure,” Mayor Eric Garcetti said during an opening ceremony.

The 4½-year construction project was part of a $14.5 billion modernization of the airport.

Located just west of the Tom Bradley International Terminal, the five-level, 750,000-square-foot (69,677-square-meter) West Gates concourse is 1,700 feet (518 meters) long.

Officials say it is based around a digitally based travel experience, including biometric boarding gates, thousands of places to plug in and access wireless internet — 5G later this year — and touchscreen kiosks. 

There are two nursing rooms, three areas for children to play and a relief area for service animals.

The airport describes the West Gates baggage handling and boarding system as the most advanced in the United States.

The airport improvement project involves all passenger terminals and new facilities including an automated people mover train, a consolidated rental car facility and a parking structure for 4,300 vehicles.

A new Metro station will at long last connect the airport to Los Angeles County’s light rail system.