> Commercial flying taxis could take off within the next five years, Boeing Chief Executive Officer Dennis Muilenburg said last week. Daunting hurdles remain be

> Commercial flying taxis could take off within the next five years, Boeing Chief Executive Officer Dennis Muilenburg said last week. Daunting hurdles remain before drones can be widely deployed, including an air traffic management system capable of staying on top of a chaotic city environment. The second sentence of that paragraph does not, to me, appear to match a 5-year time-frame.