In 1999, the Cargo Airlines Association and the Federal Aviation Administration conducted an operational evaluation (OpEval) of Cockpit Display of Traffic Information (CDTI) and Automatic Dependent Surveillance - Broadcast (ADS-B) technologies at the Airborne Express Airpark in Wilmington, Ohio. This evaluation was designed to demonstrate the benefits of CDTI, including safety, efficiency, and capacity. The evaluation included 13 aircraft of various types and their flight crews. The aircraft flew multiple flight patterns during the morning and the afternoon of a single day. Each traffic pattern flown by each aircraft was assigned to either the CDTI or baseline (no CDTI) condition.