Consider a violent drone attack on a major international airport, an airport like Riyadh, Cairo or Frankfurt. What might such an attack look like? Perhaps it would be a battery-powered remote-controlled aircraft designed to drop several kilograms of explosives into the air when it crashed into a target on the ground, such as a commercial airliner. Or it could be a multi-rotor drone, made of hardened plastic, built for market consumers, but modified so it can carry a bomb to drop on a crowd of people waiting for a shuttle bus. Any of these unmanned aerial systems (UAS) would make them difficult to be observed visually or detected by radar, let alone shot down before hitting their targets. What would be the consequences of such attacks? Imagine the consequences in terms of damage, injuries and deaths. Consider the impact on the transport network. 

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