Resilience is the ability of a system to withstand and stay operational in the face of an unexpected disturbance or unpredicted changes. Recent studies on air transport system resilience focus on topology characterist...Resilience is the ability of a system to withstand and stay operational in the face of an unexpected disturbance or unpredicted changes. Recent studies on air transport system resilience focus on topology characteristics after the disturbance and measure the robustness of the network with respect to connectivity. The dynamic processes occurring at the node and link levels are often ignored. Here we analyze airport network resilience by considering both structural and dynamical aspects. We develop a simulation model to study the operational performance of the air transport system when airports operate at degraded capacity rather than completely shutting down. Our analyses show that the system deteriorates soon after disruptive events occur but returns to an acceptable level after a period of time. Static resilience of the airport network is captured by a phase transition in which a small change to airport capacity will result in a sharp change in system punctuality. After the phase transition point, decreasing airport capacity has little impact on system performance. Critical airports which have significant influence on the performance of whole system are identified, and we find that some of these cannot be detected based on the analysis of network structural indicators alone. Our work shows that air transport system’s resilience can be well understood by combining network science and operational dynamics.展开更多
Most Level 3 airports around the world suffer severe congestion and flight delays.Airlines have to obtain airport slots in order to schedule flights at such airports.The main way for airlines to acquire slots is prima...Most Level 3 airports around the world suffer severe congestion and flight delays.Airlines have to obtain airport slots in order to schedule flights at such airports.The main way for airlines to acquire slots is primary slot allocation,in which a slot coordinator distributes slots to airlines according to certain rules and regulations.Due to excessive demand for slots and restrictions on allocation rules,it is difficult for some airlines to obtain the desired slots in this manner.Another way for airlines to obtain slots is through secondary slot trading,in which slots can be redistributed among airlines without being returned to slot pool.The secondary trading of airport slots has played a positive role in promoting the efficient utilization of slot resources,but systematic studies are insufficient.This paper discusses the reasons for the existence of slot secondary trading,sorts out the main policies and rules governing the mechanism,investigates its impacts on the industry and society,and points out the major problems and challenges.The paper provides a reference for subsequent research and practical application of airport slot secondary trading in the future.展开更多
Although the air industry has been affected by the recent coronavirus disease 2019 pandemic,it has shown rapid growth in economic development and evolving international trading worldwide.Such a trend is anticipated to...Although the air industry has been affected by the recent coronavirus disease 2019 pandemic,it has shown rapid growth in economic development and evolving international trading worldwide.Such a trend is anticipated to resume post the pandemic,probably at a slightly slower pace.The growth of the air industry accelerated the movement of goods and people but also created challenges to air transportation systems,including operational inefficiency of airspace system,flight and passenger delays,divergent demands in aircraft manufacturing,and urgent needs for disruptive technologies to enhance the existing air transportation system.Such challenges attracted the interests of researchers worldwide.This special issue assembles novel methodologies in air transportation,the cutting-edge findings,and outcomes of researchers’efforts responding to these challenges.It fills the gaps in existing literature and offers solutions and directions on sustainable development of air transportation.展开更多
Valentine's Day has come and gone for this year, and I only got one small present. That may sound like I'm complaining, but I'm not, for it was the most wonderful gift I have ever received on that spec... Valentine's Day has come and gone for this year, and I only got one small present. That may sound like I'm complaining, but I'm not, for it was the most wonderful gift I have ever received on that special day.……展开更多
The market of low-altitude economy has the po-tential to reach trillion dollars in 10 years globally.In China,it serves as a hallmark of national strategic emerging industries,and represents new quality productive for...The market of low-altitude economy has the po-tential to reach trillion dollars in 10 years globally.In China,it serves as a hallmark of national strategic emerging industries,and represents new quality productive forces.Exploring innovative engineering and technologies for low-altitude economy infrastructure is expected to promote sustainable growth in this sector.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 61773203, U1833126, 61304190)the Open Funds of Graduate Innovation Base (Lab) of Nanjing University of Aeronautics and Astronautics of China (No. kfjj20180703)+1 种基金the State Key Laboratory of Air Traffic Management System and Technology of China (No. SKLATM201707)the Hong Kong Research Grant Council General Research Fund of China (No. 11209717)
文摘Resilience is the ability of a system to withstand and stay operational in the face of an unexpected disturbance or unpredicted changes. Recent studies on air transport system resilience focus on topology characteristics after the disturbance and measure the robustness of the network with respect to connectivity. The dynamic processes occurring at the node and link levels are often ignored. Here we analyze airport network resilience by considering both structural and dynamical aspects. We develop a simulation model to study the operational performance of the air transport system when airports operate at degraded capacity rather than completely shutting down. Our analyses show that the system deteriorates soon after disruptive events occur but returns to an acceptable level after a period of time. Static resilience of the airport network is captured by a phase transition in which a small change to airport capacity will result in a sharp change in system punctuality. After the phase transition point, decreasing airport capacity has little impact on system performance. Critical airports which have significant influence on the performance of whole system are identified, and we find that some of these cannot be detected based on the analysis of network structural indicators alone. Our work shows that air transport system’s resilience can be well understood by combining network science and operational dynamics.
基金supported by the National Natural Science Foundation of China(Nos.U2033203,52272333,U1833126,61773203)。
文摘Most Level 3 airports around the world suffer severe congestion and flight delays.Airlines have to obtain airport slots in order to schedule flights at such airports.The main way for airlines to acquire slots is primary slot allocation,in which a slot coordinator distributes slots to airlines according to certain rules and regulations.Due to excessive demand for slots and restrictions on allocation rules,it is difficult for some airlines to obtain the desired slots in this manner.Another way for airlines to obtain slots is through secondary slot trading,in which slots can be redistributed among airlines without being returned to slot pool.The secondary trading of airport slots has played a positive role in promoting the efficient utilization of slot resources,but systematic studies are insufficient.This paper discusses the reasons for the existence of slot secondary trading,sorts out the main policies and rules governing the mechanism,investigates its impacts on the industry and society,and points out the major problems and challenges.The paper provides a reference for subsequent research and practical application of airport slot secondary trading in the future.
文摘Although the air industry has been affected by the recent coronavirus disease 2019 pandemic,it has shown rapid growth in economic development and evolving international trading worldwide.Such a trend is anticipated to resume post the pandemic,probably at a slightly slower pace.The growth of the air industry accelerated the movement of goods and people but also created challenges to air transportation systems,including operational inefficiency of airspace system,flight and passenger delays,divergent demands in aircraft manufacturing,and urgent needs for disruptive technologies to enhance the existing air transportation system.Such challenges attracted the interests of researchers worldwide.This special issue assembles novel methodologies in air transportation,the cutting-edge findings,and outcomes of researchers’efforts responding to these challenges.It fills the gaps in existing literature and offers solutions and directions on sustainable development of air transportation.
文摘 Valentine's Day has come and gone for this year, and I only got one small present. That may sound like I'm complaining, but I'm not, for it was the most wonderful gift I have ever received on that special day.……
文摘The market of low-altitude economy has the po-tential to reach trillion dollars in 10 years globally.In China,it serves as a hallmark of national strategic emerging industries,and represents new quality productive forces.Exploring innovative engineering and technologies for low-altitude economy infrastructure is expected to promote sustainable growth in this sector.
