That challenge will be met with new technology. Currently, airplanes and helicopters with onboard human pilots work with "see and avoid" rules, in which pilots see other vehicles and follow rules about right-of-way to avoid collisions. Drones lack onboard human eyeballs, so they need a different approach. The goal is "sense and avoid," where drones can detect each other and other flying objects, be they airplanes, helicopters, or geese. Drones will need to be able to safely plot a course that avoids collision. This technology is very much still in development, but the FAA wants it ready to go before unleashing swarms of flying delivery robots on the skies.