ATLANTA — Officials in Atlanta are laying the groundwork for an expansion of the world’s busiest airport.

Hartsfield-Jackson Atlanta International Airport officials unveiled details Thursday for a $6 billion expansion and renovation project. Airport General Manager Miguel Southwell said plans include a giant, translucent canopy that will cover the streets and sidewalks outside the main terminal.

Workers will update the domestic passenger terminal and concourses, and add a sixth runway and a hotel.

Work begins on concourse renovations later this year. The project accelerates next year with work on parking decks and passenger gates, and the terminal renovation.

The airport handled 101.5 million passengers last year, more than any other in the U.S.