Terms such as Digital Tower, Virtual Tower and Remote Tower increasingly appear in press releases, political discussions and media reports. They are often used interchangeably, giving the impression that they all describe the same concept.
In reality, they do not!
A Digital Tower, a Virtual Tower and a Remote Tower represent fundamentally different operational models. Understanding the difference is important because the terminology used can significantly influence how projects are perceived by politicians, journalists and the public.
One recent example is Belgium’s new “Digital Tower Centre” in Namur. The project was officially announced in 2021, was initially expected to become operational by 2025 and is now planned for 2027… While the term “Digital Tower” is frequently used, the operational concept is in reality a Remote Tower Centre, where controllers will provide services for airports such as Charleroi and Liège from a location away from those airports.
This example illustrates why terminology matters and why it is worth taking a closer look at what these different terms actually mean.
At the same time, conventional control towers across Europe are already highly digital. This article explains the difference between Digital Towers, Virtual Towers and Remote Towers, and why terminology matters.
Three Terms Often Mixed Together
- Digital Tower – A conventional control tower equipped with modern digital systems while retaining direct visual observation of the airport. Some Digital Towers may also be Hybrid Towers, combining direct observation with camera and sensor displays, but a tower does not need these features to be considered digital.
- Virtual Tower – Controllers remain at the airport but work from a building or room without direct visual access to the airfield. Observation is provided entirely through cameras and sensors.
- Remote Tower – Controllers provide tower services from a location away from the airport, using cameras and sensors installed at the aerodrome.
While these concepts are often presented as similar, they represent fundamentally different operational models.
Key Takeaway
Modern control towers are already highly digital. The real question is not digitalization itself, but whether controllers continue to observe the airport directly or rely entirely on cameras and sensors, and whether they remain at the airport or are relocated elsewhere.
Today’s Towers Are Already Digital!
One of the most common misconceptions surrounding Virtual and Remote Tower projects is the idea that current control towers are somehow “analog” and that digitalization only arrives with camera-based tower concepts.
This is simply not the case.
Modern air traffic control towers already rely heavily on digital technology. Electronic flight strips, surveillance systems, multilateration, ADS-B, digital weather information, electronic coordination tools and advanced ATM software have become standard tools in many tower environments.
Luxembourg Airport is also already digital in many areas. The current tower already operates with digital systems, and the future Hybrid Tower project will further enhance the use of digital tools. At the same time, controllers will continue to have a direct 360-degree view of the airfield through conventional tower windows.
Some media reports and illustrations may unintentionally create the impression that controllers will primarily observe the airport through large video walls. In reality, the future Luxembourg Hybrid Tower will keep its direct out-the-window view. Additional screens and camera feeds will complement the controller’s view, not replace it.
Digitalization and Virtual or Remote Tower operations are therefore not the same thing.
The Real Question: Where Is The Controller?
The fundamental distinction is not whether technology is digital.
These two questions are at the heart of the discussion. Modern control towers can all use advanced digital technology, yet they may operate in very different ways. Some concepts preserve direct visual observation, while others rely entirely on cameras and sensors. Some keep controllers at the airport, while others move them to a remote location.
Once these differences are understood, the terminology becomes much clearer.
The fundamental distinction is not whether technology is digital.
Does the controller still have a direct view of the airport, and where is the controller physically located?
Overview Of Tower Concepts
| Tower Concept | Direct Visual View | Controller Location |
|---|---|---|
| Conventional / Digital Tower | Yes | At the airport |
| Hybrid Tower | Yes + Cameras/Sensors | At the airport |
| Virtual Tower | No | At the airport |
| Remote Tower | No | Away from the airport |
| Multiple Remote Tower | No | One center may serve several airports |
Note: Most commercial airport towers today are already highly digital. Electronic flight strips, surveillance systems, ADS-B, multilateration, digital weather information and electronic coordination tools have become standard equipment in modern towers. For this reason, a “Digital Tower” is usually not a separate operational concept, but rather a description of the technology used within a tower.
Technology Is Not The Same As Situational Awareness
Supporters of Virtual and Remote Tower projects often highlight features such as high-resolution cameras, zoom functions, infrared sensors, object recognition and automatic tracking systems.
These technologies can certainly provide useful information and may even offer advantages in specific situations.
However, tower control is not simply about identifying a single aircraft. It is about maintaining continuous situational awareness of everything happening on and around the airport.
At the same time, one aircraft may be at the holding point, another on short final, one on downwind, another leaving the apron, a vehicle may request a runway crossing, and a helicopter or training aircraft may appear in the circuit.
Turning the head left, right, up or down takes only a fraction of a second. Selecting a camera, using a mouse, zooming in and then returning to the general picture is a completely different way of working. The challenge is not seeing more detail.
The challenge is maintaining awareness of everything at once.
This is why many controller discussions focus less on image quality and more on:
- Field of view
- Situational awareness
- Workload
- Human factors
- Latency
- Failure modes
- Abnormal situations
A telescope can show more detail than your eyes.
But you would not drive a car by looking through a telescope.
Many Safety Features Do Not Require A Virtual Or Remote Tower
Many of the technologies often cited as advantages of Virtual or Remote Towers are not inherently linked to the Remote Tower concept itself. In reality, a number of these tools can also be deployed in conventional or Hybrid Towers.
Important:
Several technologies commonly associated with Virtual or Remote Towers can be implemented independently of whether controllers work from a remote facility or from a tower at the airport.
- ✅ A-SMGCS (ground surveillance, vehicle tracking, safety alerts)
- ✅ Stop bars
- ✅ Electronic flight strips
- ✅ Optional camera image overlays* (aircraft and vehicle labels) in a Hybrid Tower
None of these technologies require a Remote Tower and can be integrated into conventional or Hybrid Tower operations as well.
Most air traffic controllers welcome technological improvements that enhance safety, situational awareness and operational efficiency.
The debate is therefore not about whether modern technology should be used. Rather, it is about how that technology should be integrated into the operational environment.
The key question is whether the potential benefits of replacing direct visual observation from a tower with camera-based observation outweigh the associated operational, human-factor and resilience considerations.
*Note: Camera image overlays can assist controllers by displaying aircraft and vehicle identification directly on the video image. However, their overall operational benefit remains a subject of debate. While supporters argue that such overlays can improve situational awareness and speed up identification, others point to the risk of increased visual clutter, heads-down operation and overreliance on displayed information. For this reason, they are generally regarded as additional situational-awareness tools rather than universally accepted safety enhancements.
Why The Terminology Matters
Words shape public perception.
Most people associate the term “Digital Tower” with technological progress and modernization. However, Virtual and Remote Tower concepts may also involve important operational changes:
- Loss of direct visual observation
- Dependence on cameras, networks and sensors
- Reduced resilience during abnormal situations or technical failures
- Easier future centralization of services
- Potential staffing and organizational changes once operations are detached from the airport itself
Whether these developments are advantages or disadvantages is a matter for debate.
What matters is that discussions are based on clear and accurate terminology.
Further Reading
The purpose of this article is to explain the terminology and the differences between Digital, Virtual and Remote Towers.
Readers interested in a more detailed operational and safety analysis can consult our Remote Tower Feasibility Study at Luxembourg Airport (ELLX).
The study examines operational, technical, human-factor and resilience aspects of Virtual and Remote Tower concepts and explains why these technologies may be suitable for some airports while presenting significant challenges for others.
Conclusion
Modern towers are already digital.
A Digital Tower is primarily a technological description. A Virtual Tower and a Remote Tower are operational concepts.
The real debate is therefore not about digitalization itself.
The real debate is whether direct visual observation should be replaced by camera-based observation and whether controllers should continue to work at the airport or from a remote location.
A modern airport can be highly digital without using a Virtual or Remote Tower.