From delivery drones to flying taxis, China has pledged to develop its low-altitude economy as it rapidly embraces new technology for manned and unmanned aircraft.  The commercial capital of Shanghai is racing to become the first "city in the sky,"  with companies there testing ways to cut down delivery times for perishable goods and essential medicines, as well as developing innovative forms of transport. "Once the economic and safety and comfortable performance have been approved, this is going to scale up very fast," says Dong Ming the CEO of VOLANT which makes electric vertical take-off and landing (eVTOL) aircraft. IMAGES AND SOUNDBITES