 This new people mover, officially known as the Airport Transit System, or ATS, was a $127 million investment designed to enhance passenger convenience and efficiency. With inflatable rubber tires on an elevated track, the ATS ensured a quiet and swift journey between O'Hare's remote parking lots and the main airport terminal. This system's continuous 24-7 operation ensured that passengers can always rely on it for transit within the airport, providing a sense of assurance and peace of mind.