Good morning. The airport is run by a British company, and has been since before September 11. They mainly run the terminal building (concessions, cleaning, etc.). Security around the perimeter is run by the airport police, who are paid by this company and are all Indiana people. TSA runs the screening of passengers, etc.
The current company does a great job, and is much better than the previous company, which was American but couldn't even seem to keep the bathrooms clean or operate decent restaurants.