Aviation information and management systems, wireless data networks, control towers and mobile control towers, avionics, training equipment, simulation and emulation devices, antennas, communication equipment, data links, voice communication systems, consoles and control positions, displays, flight data processors, ground-to-ground ATC data networks, environmental monitoring, headsets, integrated telephone service systems, ground navigation aids and ground operations, lighting, meteorological equipment, safety systems, navigation, modular system equipment, landing system equipment, software development, remote maintenance monitoring, surveillance systems, training centers, etc. (Copyright of this content belongs to Juzhan. Unauthorized reproduction is prohibited.)