Hartsfield-Jackson Atlanta International Airport in US will unveil the new $1.4bn Maynard Holbrook Jackson Jr. International Terminal in May 2012.
The new building features separate levels for arriving and departing passengers and a new concourse with 12 gates for international flights, raising the number of international gates to 40.
The construction also involved digging a 90ft trench under an existing concourse to extend the airport's internal subway system to the new terminal.
Atlanta's new terminal will also feature a new system replacing the old baggage re-check process for international travellers to reduce travel times by 45 minutes for international flyers.
Atlanta airport's spokesman was quoted by Associated Press as saying that the airport is America's new global gateway.
"It gives international passengers their own facility and it creates a new front door for the airport," spokesman said.
"And it eases the load on the rest of the facility."
The airport had handled about 10 million international passengers last year, and the Federal Aviation Administration (FAA) is expecting that the number will increase to more than 13 million by 2015.
The project was proposed in 2000 to handle the anticipated rise of international travellers and has taken four years to complete.
Of the total $1.4bn investment, about $1bn has been funded by municipal bonds that would be repaid by passenger fees, and the remaining $400m by the airlines.
Image: The new terminal at the airport will facilitate the airport to handle more than 13 million passengers by 2015. Photo: Omoo