Equipped with a connectivity payload, AALTO's Zephyr HAPS can become a tower in the sky. AALTO's default, in-house connectivity payload is designed to expand 4G/5G networks.

Zephyr is a payload agnostic platform, which means that AALTO can look at integrating other suitable payload to deliver other types of connectivity; such as 2G, Tetra, VHF or UHF — to fulfil various customer requirements.

Operating in the stratosphere above 60,000 feet (approximately twice the cruising altitude of a commercial aircraft), AALTO's in-house D2D payload can provide a coverage of approximately 7,500 square kilometres (for reference, the total size of Puerto Rico is 9,100 sq. km.). In the most challenging mountainous terrains, covering this area could require an equivalent of up to 250 traditional ground towers.