1. A method, comprising: generating acoustic signals, by one or more acoustic sensors of an unmanned aerial vehicle (UAV), from acoustic waves generated by propulsion of a flying object; determining one or more characteristic features of the acoustic signals; identifying the flying object based at least in part on a comparison of the one or more characteristic features to a database of known acoustic signals; associating performance parameters with the flying object using a database that includes performance parameters for at least one of a plurality of flying objects or class of flying objects; determining a location and an airspeed associated with the flying object based at least in part on the acoustic signals; determining a trajectory envelope for the flying object based at least in part on the location, the airspeed and the associated performance parameters; and updating a flight plan for the UAV based at least in part on the trajectory envelope of the flying object, wherein the updated flight plan does not interact with the trajectory envelope of the flying object.