Introduction -- An Overview on IoUT and UAV-assisted applications -- Mobility, traffic models and network management for IoUT -- Energy efficiency in IoUT -- Security, privacy, and trust in IoUT -- Mobile edge computing in IoUT -- Performance, scalability, reliability and efficiency of Inter-UAV and UAV-to-X communications -- Machine-learning techniques for IoUT -- Inter-UAV communications over future internet architectures -- 5G and beyond for IoUT -- Explainable artificial intelligence and semantic representation and reasoning for IoUT -- Testbeds and validation of IoUT solutions -- Conclusion.