To keep load factors high while offering high frequency service, airlines tend to reduce the size of the aircraft they use. At many of the world’s largest airports there are fewer than 100 passengers per air transport movement, although congestion and delays are growing. Furthermore, demand...

“Green growth” and transport combines several different concepts that are central to sustainable mobility, including sustainable economic activity, reduced environmental impact and sustained growth in high quality jobs. It attempts to balance the importance of economic growth, with...