The provided sources offer a comprehensive overview of automated last-mile delivery technologies, primarily focusing on a comparison between air drones (UAVs) and delivery bots (SUGVs), and also introducing eVTOL aircraft. Multiple analyses examine the economic, environmental, and logistical viability of these systems, including complex models for cost calculus and life cycle assessments for different delivery methods, such as truck-drone systems and multi-tiered delivery via hubs. Furthermore, the texts explore the safety and regulatory challenges of aerial delivery, noting public opposition due to concerns like theft and accidents, while highlighting the Federal Aviation Administration's efforts to establish a performance-based regulatory pathway for Beyond Visual Line of Sight (BVLOS) operations and commercial package delivery. Specific applications are detailed, such as emergency medical delivery in the Turin area and the successful deployment of companies like Zipline for urgent medical supplies in countries like Rwanda and Ghana.