Delta Air Lines is refreshing and expanding a number of its Sky Club premium lounges, including those in Atlanta and Nashville.

The Atlanta Business Chronicle reports that the Delta Sky Club at Hartsfield-Jackson International Airport’s Concourse A is being expanded, with more seating and restrooms being added.

The lounge, one of nine Sky Clubs at the world’s busiest airport and Delta hub, will remain open during construction.

The project is part of a global plan to improve existing Sky Clubs and open new lounges.

The Nashville Post reports that the Sky Club at Nashville International Airport is being greatly expanded, with an additional 10,500 square feet added to the existing 3,000 square foot lounge. The existing lounge space also will be renovated as part of the $18.7 million project.

 The Nashville expansion will be completed by the end of 2020, and includes more seating and food and beverage options, according to Delta.

Delta also recently began construction on a new Sky Club at Tokyo’s Haneda International Airport.