SoftBank Corp. completed initial testing of Altaeros' ST-Flex autonomous aerostat. Operational and telecom tests were performed at Hokkaido Spaceport, Taiki Town, Hokkaido, Japan.

SoftBank and Altaeros first launched the ST-Flex on May 2, 2022 and performed evaluation tests through May. ST-Flex carried SoftBank's base station system, which was equipped with its proprietary cylindrical antenna that realizes communication area footprint fixation, to a height of 816 feet, where it was connected to their ground equipment via optical fiber and power conductors embedded in the tethers. Aerostat Autopilot, Altaeros' proprietary autonomous control system, eliminates on-site crew for daily operations and ensures the highest level of reliability, making ST-Flex the most cost-effective aerostat solution in its class.

During the test program, the ST-Flex excelled in highly variable weather conditions, including gale-force wind. Altaeros' three tether autonomous controls create stability in the aerostat and control pitch, roll, and yaw to keep the aerostat steady even in varying weather conditions. The autonomous features provide a level of performance and flexibility unparalleled amongst commercial unmanned aerial vehicles.