this is very comprehensive and well researched.

Drones are going to solve our centuries-old problem of urban gridlock, by safely, quietly, and sustainably moving the transportation of growing quantities of goods and people into the third dimension, the air. Unlike digging underground, which will go far slower, these systems will take us nearly point-to-point, they are far easier to scale, and their load can increase with demand, with no additional construction costs.

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