LINTHICUM, Md. (AP) — A $100 million project to upgrade of the oldest portion of Baltimore-Washington International Thurgood Marshall Airport is under way.

The work will allow passengers to move between concourses A, B and C without passing through security again.

The project will also add a connector to provide passengers access between the 14 gates at concourse C with the 26 gates at concourses A and B. In addition, about 8,500 square feet of new food and retail space will be added to concourse C.

The work is scheduled to be completed by summer 2013.

(© Copyright 2012 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)