The Shenzhen Airport’s Civil Flight Departure System has high-level demand for security and stability. 20 minutes of operation interruption is considered major security disaster. Since Phantosys came into service on January 1, 2004, the operation has been stable without fault for over 3 years. The Phantosys enables zero-maintenance for the system by implementation of a redundant server to ensure continuous normal operation of the whole system. All it takes is one simple system restart to remove either client-side or server-side fault.