  We propose a novel failure-aware reactive UAV delivery service composition
framework. A skyway network infrastructure is presented for the effective
provisioning of services in urban areas. We present a formal drone delivery
service model and a system architecture for reactive drone delivery services.
We develop radius-based, cell density-based, and two-phased algorithms to
reduce the search space and perform reactive service compositions when a
service failure occurs. We conduct a set of experiments with a real drone
dataset to demonstrate the effectiveness of our proposed approach.
