High above passenger jets and far below satellites, a new generation of flying telecom platforms is quietly preparing for takeoff.
While satellite mega-constellations grab headlines, engineers are betting on a different layer of the sky – the stratosphere – to finally connect the billions of people still offline, more cheaply and more reliably than space-based systems alone.
Nearly a quarter of humanity still offline
In 2026, the planet will bristle with spacecraft. Starlink is set to have around 10,000 satellites in orbit. OneWeb plans roughly 650. Telecoms marketers talk confidently about “global coverage”.
The reality on the ground looks very different.
According to the ITU’s “Facts and Figures 2025” report, around 2.2 billion people, many in rural or isolated regions, still lack a usable internet connection. That’s close to one person in four, either completely disconnected or forced to rely on painfully slow, unreliable links.
Even with thousands of satellites overhead, connectivity gaps remain stubborn, especially in remote and low-income regions.
Satellite networks struggle with three core limits:
- Capacity constraints: From hundreds of kilometres up, each satellite must serve huge areas. When too many users pile on, speeds drop sharply.
- Cost and complexity: Building and maintaining a dense low‑Earth orbit constellation that covers every point on the globe is technically demanding and extremely expensive.
- User pricing: Equipment and subscription costs stay far out of reach for many households in developing countries.
Telecoms players are now turning their attention to a cheaper, closer layer of the sky to plug those gaps.
Stratospheric internet: the layer between earth and space
The emerging alternative is known as stratospheric internet, based on HAPS – High Altitude Platform Stations. These are long-endurance aircraft, balloons, or airships operating roughly 18 to 25 kilometres above sea level, far above commercial jets but much lower than satellites in orbit at around 500 kilometres or more.
HAPS can take several forms:
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- Helium airships
- Super‑pressure balloons
- Solar-powered drones or gliders
- Uncrewed fixed‑wing aircraft designed for ultra‑long endurance
Most are covered in solar panels and backed by high-density batteries. At those altitudes, they can soak up sunlight for long hours, stay aloft for weeks or even months, and operate with limited fuel or maintenance.
By cutting the distance between transmitter and user from hundreds of kilometres to just a few dozen, stratospheric platforms can provide fast, low‑latency links at much lower cost.
Each platform can cover a region spanning tens or even hundreds of thousands of square kilometres. That makes them ideal for sparse areas where physical fibre cables and dense cellular networks are too expensive: deserts, mountain ranges, remote islands or vast rural regions.
Why satellites alone cannot finish the job
From space, a satellite sees a huge footprint. That sounds convenient, but it creates a brutal trade-off: either you serve many users with limited bandwidth each, or you restrict service to keep speeds acceptable. Satellites must also fight atmospheric effects, harsher space weather, and more complex routing.
Low‑Earth orbit systems like Starlink improve latency by flying closer to Earth than older geostationary satellites. Yet they still orbit far above any aircraft and must move continuously relative to the ground, handing connections from one satellite to another.
Stratospheric platforms, in contrast, operate in a thin slice of stable air. They can hover – or at least loiter in a tight pattern – above a specific region, using on-board propulsion and clever flight algorithms to hold position against stratospheric winds.
A second life for an old idea
The concept is not new. Telecom researchers started working on high-altitude platforms in the 1990s. In the 2000s, test flights proved technically promising but costly. The best-known example was Alphabet’s Project Loon, launched in 2011, which used a fleet of balloons to beam internet to underserved regions.
Loon managed some high-profile demonstrations, including emergency coverage after natural disasters. Yet the project shut down in 2021. Keeping each balloon where it was needed, dealing with strong winds, recovering hardware and running constant launches all pushed costs too high compared with rapidly industrialising satellite constellations.
Since then, three things have changed: solar technologies have improved, batteries have become lighter and more powerful, and telecommunications hardware has shrunk dramatically. That shift is breathing new life into the idea.
The new wave of stratospheric internet players
Several companies now claim they can do what Loon could not: hold position in the stratosphere for weeks, at commercially viable costs.
| Company | Platform type | Altitude range | Notable capability |
|---|---|---|---|
| Sceye (US) | Solar helium airship | ~20 km | Long-endurance, precise station-keeping |
| Aalto HAPS (Airbus, EU) | Solar drone (Zephyr) | Stratospheric | Record 67 days continuous flight |
| World Mobile (UK) | Hydrogen drone | High altitude | Bandwidth up to 200 Mbps |
Sceye: a giant solar airship over the desert
US start‑up Sceye has built a 65‑metre‑long helium airship clad in solar panels. Designed to sit in the lower stratosphere, it carries telecom payloads and uses on-board propulsion to stay almost motionless over a target area.
The company aims to demonstrate operational internet service from the stratosphere, starting with trials in remote regions where terrestrial infrastructure is thin or damaged.
Aalto’s Zephyr: gliding on sunlight
Aalto HAPS, a subsidiary of Airbus, has developed Zephyr, a slender solar-powered drone with a wingspan of about 25 metres. It’s built from ultra-light materials and flies above weather systems, where turbulence is lower and the sun is more predictable.
Zephyr has already stayed airborne for 67 days in a row, a record for an uncrewed aircraft. During such missions, it can circle slowly over a region, acting like a floating mobile tower in the sky.
World Mobile: a price challenge to Starlink
British firm World Mobile is working on hydrogen-fuelled high-altitude drones with a specific focus: driving costs down so low that connectivity becomes affordable even for low-income communities.
Each platform is designed to provide bandwidth of around 200 megabits per second. The company uses a stark comparison to illustrate the potential. It estimates that nine such platforms could cover the whole of Scotland – some 5.5 million people – at a cost of around £0.80 per person per month.
By World Mobile’s estimate, high-altitude platforms could serve a whole country for less than one pound per user each month, vastly undercutting satellite subscriptions.
For reference, a typical Starlink subscription in the UK sits closer to £75 per month, plus equipment costs. The performance will not be identical, but the gap shows how sharply economics can shift when infrastructure sits 20 kilometres above users rather than in space.
Working alongside satellites and ground networks
Stratospheric internet is not meant to replace satellites or ground-based mobile networks. Instead, it plugs holes between them.
- In dense cities, fibre and 5G will usually remain the fastest and most stable option.
- In mid‑density areas, conventional towers and microwave backhaul can do most of the job, with HAPS filling patchy zones.
- In remote regions, a handful of high‑altitude platforms could provide the only realistic way to deliver broadband without massive infrastructure spending.
The tough part now sits outside pure engineering. Regulators around the world must define how HAPS share radio spectrum with existing services, how they coordinate with satellites, and what airspace and safety rules apply. Without harmonised rules, operators could face delays or fragmented markets.
Latency, bandwidth and other jargon, simply explained
Three technical terms sit at the heart of the debate around stratospheric connectivity:
- Latency: The time data takes to travel from your device to a server and back again. Lower latency means snappier web browsing, smoother video calls and more responsive online gaming. Because HAPS are closer to Earth than satellites, they can keep latency closer to that of 4G or 5G networks.
- Bandwidth: The maximum amount of data that can be sent per second through a connection. Think of it as the width of a motorway: more lanes, more cars. A single high-altitude platform can deliver hundreds of megabits per second to share among users below.
- Throughput: The actual speed users experience. This depends on bandwidth, how many people share it and how efficiently the system handles traffic.
Because HAPS serve limited geographic zones, operators can tune capacity more finely than with remote satellites. That fine-grained control may prove crucial in regions where demand fluctuates with agriculture seasons, tourism or migration.
Risks, benefits and future scenarios
Several risks shadow the rise of stratospheric internet. Persistent aircraft and airships raise airspace management questions. Failures at altitude could pose safety risks if vehicles descend in populated areas. Cybersecurity also matters: a single compromised platform could disrupt service across a wide region.
Weather at 20 kilometres is calmer than at airline altitudes, but not perfectly stable. Platforms must withstand strong winds, low temperatures and intense UV radiation over long periods. Any maintenance involves complex recovery and relaunch operations.
The benefits, though, attract both governments and private investors:
- Faster emergency deployments after earthquakes, floods or conflicts
- Affordable connectivity for schools and clinics in isolated communities
- Backup links when terrestrial infrastructure fails
- Support for environmental monitoring and border surveillance
One realistic scenario sees countries using a mix of infrastructure: fibre in cities, 5G for suburbs, and stratospheric platforms to reach villages and farms beyond economic reach of towers and cables. Another scenario uses HAPS as temporary “pop‑up coverage” during major events or in regions hit by long-term infrastructure damage.
For now, Starlink-like constellations still dominate the conversation around global coverage. Yet as high-altitude platforms mature and regulatory frameworks solidify, the idea that the most effective internet might not come from space at all is starting to look less like science fiction, and more like a business plan.