Described are example systems and methods for facilitating management of flight planning and operations for unmanned vehicles, such as unmanned aerial vehicles (UAVs). The described systems and methods can facilitate generation of a risk-based model that incorporates the risk presented by certain flight paths as well as the risk of collisions between concurrently operating vehicles. The described systems and methods can also facilitate determining a lowest relative total risk for planned concurrent operations. The total risk can also be compared against a risk threshold to determine whether the total risk associated with the planned operations is within an acceptable range.