Some embodiments provide a system to identify geographic zones into which unmanned aircraft systems (UAS) are inhibited from flying. In some instances, the system detects, while the UAS is in flight and traveling along a flight path to a delivery location where the UAS is scheduled to deliver a package, a no fly zone (NFZ) into which the UAS is to avoid flying; obtains a revised flight path to the delivery location that includes a detour route around the no fly zone; directs the motor controller to control the motors to implement the revised flight path; and detects when the UAS is at a threshold distance from the delivery location and initiate delivery of the package.