AirNet is an American Part 135 cargo airline based in Franklin County, Ohio, USA, near Columbus. It specializes in delivery of documents and small packages. Banks were once their main client, transporting checks for over 300 of the country's largest banks. With the passing of the Check 21 Act, and the increase in the usage of electronic banking, this has been greatly reduced. AirNet is now focusing on time critical documents and packages, such as those required in the scientific and medical field. The main sort facility is located at Rickenbacker International Airport in Columbus. In September 2008, AirNet announced that they were moving their sort facility to Chicago, reducing the number of aircraft, and redesigning their route network. Their corporate headquarters remains in Columbus