1. College of Air Traffic Management Civil Aviation University of China Tianjin 300300 China
2. College of Aeronautical Engineering Civil Aviation University of China Tianjin 300300 China
3. College of Science Civil Aviation University of China Tianjin 300300 China
4. College of Economics and Management Civil Aviation University of China Tianjin 300300 China
5. Chemical and Environmental Engineering, School of Engineering RMIT University Melbourne, Victoria 3000 Australia