Inflight Wi-Fi is today often perceived as a standard cabin service, but the development of connectivity in the air was long and largely driven by safety needs rather than passenger demand. Satellite communications in civil aviation began decades before passengers could connect to the internet at all. As early as the late 1980s and early 1990s, aircraft started using satellites for crew voice communications, the transmission of operational messages, and basic data services, primarily on intercontinental and oceanic routes.
In that early phase, Inmarsat played a key role, with its L-band satellites enabling global aircraft connectivity where conventional VHF and HF radio links were insufficient. These systems became the backbone of modern long-haul aviation and remain safety-relevant to this day. During the 1990s and early 2000s, satellite communication became available to passengers for the first time, through built-in satellite phones in seatbacks or the cabin. Although extremely expensive and limited in quality, these calls represented the first tangible step toward the idea of continuous passenger connectivity in flight.
It is important to emphasize that satellite communication on aircraft has never been developed solely as a commercial service. Inmarsat’s L-band systems are still an integral part of the safety and operational infrastructure of global air transport. Their importance became widely recognized after the disappearance of Malaysia Airlines flight MH370, when satellite “handshake” signals made it possible to reconstruct the final known phases of the flight. That case clearly demonstrated that inflight connectivity is not just about passenger Wi-Fi, but also a critical tool for safety, monitoring, and investigations.
Passenger internet in the modern sense began to develop only in the mid-2000s. The first commercial systems enabled basic web browsing and email, initially through terrestrial air-to-ground networks in the United States, and later via Ku-band satellite systems on long-haul routes. During the 2010s, inflight Wi-Fi became almost a standard offering among major network carriers, albeit still with significant technical compromises, above all in latency and connection stability. A true paradigm shift has occurred only in recent years with the emergence of LEO satellite constellations, which for the first time enable a combination of very low latency and high capacity.
Orbits and frequency bands: the fundamental differences between systems
Differences between inflight systems stem from two key technical variables: satellite orbit and frequency band. Satellites in geostationary orbit are located at an altitude of 35,786 kilometers above the equator and orbit the Earth at the same angular speed as the Earth’s rotation. As a result, they remain stationary relative to the Earth, constantly positioned above the same point on the equator. This enables stable coverage of a given area, but at the cost of very great distance.
Satellites in low Earth orbit operate at altitudes of roughly 500 to 1,200 kilometers and move rapidly relative to the Earth’s surface. To ensure continuous global coverage, large constellations of satellites and constant handovers from one satellite to another are required.
Frequency bands further define system capabilities. L-band offers very low capacity but exceptional reliability and resistance to atmospheric conditions. Ku-band and Ka-band operate at higher frequencies, enabling significantly higher data rates, but require more precise antennas and are more sensitive to weather interference.
Latency: physics as the greatest limitation
Latency, or signal delay, is the decisive parameter that separates modern inflight systems. With geostationary satellites, the signal must travel from the aircraft to a satellite at an altitude of 35,786 kilometers, then to a ground station, and back along the same path. The total distance exceeds 70,000 kilometers, resulting in practical latencies of approximately 550 to 700 milliseconds.
With LEO systems, the total distance is many times shorter, reducing latency to 20 to 50 milliseconds, while terrestrial air-to-ground systems, where available, typically fall in the range of 30 to 80 milliseconds.
The slowest but indispensable: L-band systems
Inmarsat’s SwiftBroadband in L-band offers maximum speeds of up to 432 kbps, with latency of around 800 milliseconds. This is not a system designed for passenger internet, but for safety and operational communications. Despite extremely low speeds, it is the most reliable global system and is used by virtually the entire long-haul fleet of the world’s airlines in the background of their operations.
Ku-band GEO systems: the first mass-market inflight Wi-Fi
The first widely adopted passenger inflight Wi-Fi appeared with Ku-band GEO (Geostationary Earth Orbit) systems. The most widespread among them is the system integrated by Panasonic Avionics. Panasonic is not a satellite operator, but an integrator that uses Ku-band capacity from multiple GEO satellite networks and manages antennas, networking, and traffic at the aircraft level.
Typical aggregated speeds per aircraft range between 10 and 70 Mbps, with latency of 550 to 650 milliseconds. The system is technically mature and globally available, but inherently constrained by geostationary orbit. Panasonic Ku-band is used by Lufthansa, ANA, Emirates, and Singapore Airlines. Croatia Airlines also offers inflight internet on its Airbus A220 fleet via Panasonic’s Ku-band system.
Ka-band GEO systems: more capacity, the same limitations
Ka-band GEO systems use higher frequencies and provide greater overall capacity. The most prominent representative is Viasat. Under ideal conditions, the system can deliver more than 100 Mbps per aircraft, while in practice speeds most often range between 30 and 80 Mbps. Latency remains high, in the range of 600 to 700 milliseconds. The system is used by Delta Air Lines, United Airlines, and Qantas.
LEO constellations: the fastest inflight internet to date
The greatest qualitative leap has been delivered by LEO (Low Earth Orbit) constellations. Starlink operates thousands of satellites at an altitude of around 550 kilometers. Latency in practice ranges between 20 and 40 milliseconds, while aggregated capacity per aircraft often reaches 150 to 350 Mbps, making it by far the fastest inflight system today. The system is being introduced or tested by Qatar Airways, airBaltic, and United Airlines.
A similar architecture is used by OneWeb, with an orbital altitude of around 1,200 kilometers. Latency ranges between 40 and 70 milliseconds, with speeds lower than Starlink’s but multiple times better than GEO systems. OneWeb is used by Air Canada and Japan Airlines.
Aircraft antennas and why Wi-Fi disappears during takeoff and landing
Technical differences between inflight systems are particularly visible on the aircraft itself, through antenna design and operation. GEO Ku- and Ka-band systems use mechanically steered, rotating antennas housed in a radome on the upper fuselage. Because a geostationary satellite remains fixed relative to the Earth, the antenna must be physically pointed at a single spot in the sky at all times, requiring precise mechanical systems with moving parts.
LEO systems use electronically steered phased-array antennas with no moving parts. Beam direction is changed electronically, almost instantaneously, enabling continuous handovers between satellites that move rapidly relative to the aircraft. These antennas have a lower profile and a smaller aerodynamic penalty, but are more power-hungry and technically complex.
Inmarsat’s L-band systems use small, fixed antennas, as reliability rather than capacity is the priority. This is precisely why these systems operate in almost all conditions, but with very limited speeds.
Wi-Fi is generally unavailable during takeoff, approach, and at low altitudes due to a combination of technical, regulatory, and safety reasons. At low altitudes, the aircraft undergoes large changes in pitch and direction, the geometry of the satellite link is unstable, and the signal can be blocked by the fuselage or wings. At the same time, interference with sensitive ground-based communication and navigation systems near airports must be prevented. For these reasons, inflight systems are activated only in stable cruise, most commonly above approximately 10,000 feet.
Inflight connectivity has reached a point of no return
That inflight Wi-Fi is no longer an optional extra, but a core component of the passenger experience and a strategic element of airline infrastructure, is confirmed by global data published by Moment. According to its benchmark research, seven out of ten airlines worldwide now offer some form of inflight connectivity, clearly indicating that the industry has entered a mature phase.
Differences in business models remain pronounced. Nearly 89 percent of traditional network carriers already have Wi-Fi in the cabin, while 57 percent of low-cost carriers remain unconnected. The reason is not a lack of interest, but economic reality: system weight, additional fuel burn, the cost of satellite capacity, and limited monetization opportunities on short-haul flights.
At the same time, passenger expectations are changing rapidly. According to data cited by Moment, 80 percent of passengers today consider inflight Wi-Fi as important as seat comfort or schedule reliability. Connectivity in the air has thus definitively moved from the “nice to have” category into the realm of essential cabin infrastructure.
Business models are fragmenting accordingly. The freemium approach has become dominant, with messaging offered free of charge, while full internet access and streaming are monetized. Fully free Wi-Fi remains relatively rare, but its share is growing rapidly thanks to LEO systems, which significantly reduce the cost per user. Wi-Fi is also increasingly tied to loyalty programs, serving as a tool for data collection and long-term customer retention.
Moment’s conclusion is clear and hard to dispute: inflight connectivity is no longer viewed as an isolated cabin service, but as the backbone of the digital passenger ecosystem. In such an environment, the question is no longer whether aircraft will be connected, but by which technology, with what performance, and for what business purpose. The answer to that question will, in the coming years, clearly distinguish carriers that see Wi-Fi as a cost from those that use it as a strategic advantage.
