Monday marked the first big business travel day amid new road closures at the Delta Air Lines curbside at Hartsfield-Jackson International Airport.

The Atlanta airport over the weekend started construction of a massive canopy over the Terminal South curbside, which remains open but has some some lane closures and overnight closures of the upper roadway.

Airport officials recommend that, to be safe, travelers should allow an extra 20 to 30 minutes to drive to the airport and plan to be inside the terminal two hours before departure.

Atlanta-based Delta makes up more than 80 percent of all airline passenger traffic at Hartsfield-Jackson. It’s expected to take a year to complete the Terminal South canopy.

Shuttle drop-offs have been relocated to the fully re-opened Terminal North curbside, where the canopy is nearly complete.

During evening construction, when the entire Terminal South upper roadway is closed, the airport will allow passengers to unload from all lanes on the lower roadway instead of navigating to the curb.

Airport officials urged travelers to consider using MARTA or seek alternate locations for drop-offs and pick-ups.