“…To address power, connectivity and communication issues, UAS have been linked to terrestrial delivery vehicles, which can serve as power sources and replenishment sites, making other deliveries before the UAS returns to the vehicle ( Chiang et al, 2019 ). As such, UAS can serve as last mile delivery vehicles in remote areas ( Aurambout et al, 2019 ; Chiang et al, 2019 ), particularly in humanitarian ( Azmat and Kummer, 2020 ), disaster response and recovery ( Ejaz et al, 2020 ) and medical settings ( Zubin et al, 2020 ). UAS can also offer a number of sustainability advantages, reducing or transferring transportation costs to ‘greener’ modes ( Azmat and Kummer, 2020 ), and perhaps reducing the 15% of global carbon dioxide (CO 2 ) emissions attributed to the transportation sector ( Rodrigue, 2019 ; Kamble et al, 2020 ).…”