By Mugo Odigwe

CHICAGO (CBS)—The next step in a new and improved O’Hare Airport for the 21st century begins today.

The City of Chicago will break ground at 10:45 a.m. on a $1.2 billion expansion of Terminal 5, the international terminal.

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When the project is completed, 10 new gates will open, along with more space for passengers to sit and new stores and restaurants.

(Credit: City of Chicago)

The terminal upgrade is expected to be finished by 2021.

The Terminal 5 project is the first in a series of projects ahead for O’Hare.

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Five designs have been released showing a new global terminal, to replace the existing Terminal 2.

(Credit: City of Chicago)

It’s the centerpiece of an $8.5 billion expansion—the largest and most expensive in the history of the airport.

The new terminal will be funded with airline ticket fees, and is projected to open in 2028.

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(Credit: City of Chicago)