I've never understood why they opted for balloons over high altitude solar drones like Zephyr (1) which are much more maneuverable and can stay over a particular area.<p>1. <a href="https://www.airbus.com/en/products-services/defence/uas/uas-solutions/zephyr" rel="nofollow">https://www.airbus.com/en/products-services/defence/uas/uas-...</a>