The Indianapolis International Airport’s terminal building holds 33 gates and covers 673,000 square feet of land area. It is divided into two levels: on the lower level building hosts Arrivals and the upper-level Check-in and Departures area is situated, in which four concourses serve the various airlines. IND Terminal operated many major routes within the United States and Canada with airlines such as Air Canada, Delta, Air Tran, and Southwest.

The IND complex has only one terminal with four departures concourses: A, B, C, and D. More than 8 million passengers commute through Indianapolis International Airport each year from Canada and nationwide.

Concourse A serves the following commercial airlines: Air Canada Express (Jazz Air), Delta Air Lines, United Airlines, United Express (Chautauqua Airlines, CommutAir, ExpressJet, SkyWest Airlines, etc.) and Vision Airlines. Travelers arriving at gates A4 and A5 go directly to the U.S. Customs and Federal Inspection Station via stairway, elevator or escalator. After clearing customs, the exit is into the south at the domestic baggage claim area in the main terminal complex.

The concourse B serves American, Delta, and Independence Air. Concerning the concourses C and D, those terminal buildings are under the rebuilt process to expand and renovate for the convenience of IND passengers.