  Autonomous aerial delivery vehicles have gained significant interest in the
last decade. This has been enabled by technological advancements in aerial
manipulators and novel grippers with enhanced force to weight ratios.
Furthermore, improved control schemes and vehicle dynamics are better able to
model the payload and improved perception algorithms to detect key features
within the unmanned aerial vehicle's (UAV) environment. In this survey, a
systematic review of the technological advancements and open research problems
of autonomous aerial delivery vehicles is conducted. First, various types of
manipulators and grippers are discussed in detail, along with dynamic modelling
and control methods. Then, landing on static and dynamic platforms is
discussed. Subsequently, risks such as weather conditions, state estimation and
collision avoidance to ensure safe transit is considered. Finally, delivery UAV
routing is investigated which categorises the topic into two areas: drone
operations and drone-truck collaborative operations.
