Sensitivity analysis Travel time 2 Aircraft manufacturing 1 Assembly 1 Battery electric bus 1 Battery electric buses 1 Bus fleets 1 Bus transportation 1 COVID-19 1 Charging (batteries) 1 Charging infrastructures 1 Charging systems 1 Cost effectiveness 1 Costs 1 Discrete choice experiment 1 Discrete choice experiments 1 Efficiency 1 Efficiency improvement 1 Electric bus 1 Electric buses 1 Employment 1 Energy utilization 1 Face masks 1 Fighter aircraft 1 Fleet operations 1 Human resource management 1 Innovative solutions 1 Input output analysis 1 Integrated optimization 1 Intelligent systems 1