Activity levels at airports are measured by aircraft operations. An operation is defined by the FAA as a takeoff or a landing. So, a “touch and go” conducted by a training aircraft counts as two operations. In 2020, Centennial Airport accommodated 334,965 aircraft operations. However, most of the traffic is concentrated during the daytime hours. The record year at Centennial occurred in 1998, with over 466,000 aircraft operations.