Sceye and SoftBank Corp. Complete Stratospheric Connectivity Demonstration in Japan, Advancing Towards HAPS Commercialization

 Sept. 1, 2026

 Sceye announced the successful trans-Pacific flight of its Service Test 1 (ST1) mission from New Mexico to Japan. Traveling more than 15,000 km through the stratosphere in 13 days, upon arrival over Japan, ST1 demonstrated mobile broadband connectivity to unmodified devices through SoftBank Corp.'s core network and HAPS-based edge computing and communication with drones to support the development of a 3D communications network.

Conducted in partnership with SoftBank Corp. (TOKYO:9434, "SoftBank"), a leading operator of telecommunications and IT businesses in Japan and globally, ST1 marks Sceye's first flight to Asia and a groundbreaking milestone towards the commercial deployment of HAPS as stratospheric infrastructure.

"This flight marks a defining moment for Sceye and for the commercial potential of HAPS," said Mikkel Vestergaard Frandsen, Founder and CEO of Sceye. "Flying from the US to Japan demonstrates the performance required to make the stratosphere a viable layer of infrastructure and realize the future of AI, edge computing, and 6G. Together with SoftBank, we are moving beyond proving the technology to demonstrating how Sceye can complement and extend existing networks and deliver persistent connectivity at scale."

The stratosphere offers the optimal vantage point: It is close enough to Earth for high-capacity connectivity and observation, yet the altitude is high enough for wide-area reach. Importantly, the stratosphere offers space-like conditions without the cost of being in space and the disadvantages of being in orbit. Sceye's HAPS maintain altitude and their area of operation in the stratosphere through consecutive day and night cycles, operating like geostationary satellites, only 1,800 times closer to Earth and at a fraction of the cost.

In 2025, SoftBank Corp. invested in Sceye's HAPS-based stratospheric infrastructure as a scalable solution to complement terrestrial towers and satellite constellations. The strategic partnership advances a shared vision for HAPS and Non-Terrestrial Networks (NTN) as transformative infrastructure that can expand connectivity, support communications during disasters, and enable future applications across AI, IoT, aerial communications, edge computing, and 6G.

ST1 carried SceyeCELL, a first-of-its-kind "cell tower in the sky" designed to deliver wide-area mobile broadband directly to standard devices from the stratosphere. When deployed at full scale, one Sceye HAPS is designed to cover the equivalent area of approximately 500 terrestrial towers. During the ST1 mission, Sceye and SoftBank demonstrated mobile broadband from the stratosphere, including text messaging, voice calls, internet access, and video streaming. Testing also included emergency calls, using an emergency alert messaging system designed for large-scale disasters, and communications with drones.

Sceye's ST1 mission launched on August 9, 2026 at 7:00 AM MDT from New Mexico. Additional notable mission attributes include:

Traveled more than 15,000 km across the Pacific to Japan in 13 days

Operated within Japanese managed air space for over 7 days

Remained continuously within its area of operation for an extended period, achieving a station-seeking radius as low as 5 km

Operated at approximately 16.5 km in altitude while completing telecommunications, drone, and emergency communications

Confirmed communications performance equivalent to that of terrestrial networks while reducing radio interference with ground-based base stations

Through a server installed on the HAPS, Sceye and SoftBank conducted data processing directly on the platform, demonstrating average round-trip processing response time of 68 milliseconds, reducing communications latency by over 40% compared with internet-based cloud processing. This marks the world's first successful test in which a mobile core network and a web server for processing were installed on a HAPS, enabling response processing to be performed entirely onboard the HAPS and the results to be relayed back to smartphones.