Except in the case for the 787, you can't unplug the APU's mid-flight, and so hence the fire hazard. Speaking about that just how robust (and openly discussed) are the Li+ charging circuitry in these huge power storage arrays? Is there any chance of independent review of these (The FAA could be the vehicle for certifying them for flightworthiness, except past experience with that process has been very problematic in detail).
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.