Latest / The 5G Podcast with Fexingo: Wireless Networks, Carriers, and Mobile Infrastructure / How 5G Is Quietly Transforming the Airport Runway
Transcript
- Lucas: So, Luna, have you ever sat on a tarmac, looking out the window, watching planes inch forward — and wondered how the control tower actually knows where all those aircraft are in low visibility? Luna: I figured it was some combination of radar and the pilots talking to ground control. But I know it's not perfect — there have been runway incursions. Lucas: Right. And for decades, the primary tool has been something called asde x — Airport Surface Detection Equipment — which is basically a big spinning radar dish mounted on a tower. It works, but it's got blind spots, it's expensive to maintain, and it doesn't give you a clean digital picture you can feed into an algorithm. Luna: And that's where 5G comes in? Lucas: Exactly. The FAA has been pushing for what they call 'surface surveillance' — a system that tracks every vehicle and aircraft on the runway in real time, with sub-meter accuracy. And in 2026, they're mandating that all large hub airports have some form of it. The traditional solution was to upgrade the radar. But a bunch of airports are now looking at 5G private networks instead. Luna: Because 5G gives you low latency and high bandwidth, so you can put sensors everywhere and get a live map. Lucas: That's the idea. Instead of one rotating radar, you install dozens of small 5G base stations around the airfield. Then you equip every vehicle — tugs, baggage carts, fuel trucks, and of course the aircraft themselves — with a 5G transponder. The network triangulates their positions and sends that data back to the tower in real time. It's basically a private 5G network, dedicated to the airport. Luna: And this is actually happening right now? Not just a concept? Lucas: It's rolling out as we speak. Denver International Airport — one of the busiest in the US — ran a pilot with a private 5G network from Verizon in 2025. They equipped about 60 ground vehicles and tested it on one of their concourses. The result: they saw a 17 percent reduction in taxiway delays during the pilot period. That's not just convenience — that's fuel savings, reduced emissions, and fewer missed departure slots. Luna: Seventeen percent is huge. And I imagine that number gets bigger as more vehicles are equipped. But didn't we hear a lot about 5G interfering with airplane altimeters? How do they get around that? Lucas: That's the elephant in the room. The C-band spectrum that Verizon and AT&T use for 5G sits right next to the radio altimeter band that planes use for landing. There was a huge fight in 2022, with airlines warning of catastrophic interference. The compromise was that carriers agreed to lower power levels near airports and create buffer zones. But for these private airport networks, they use a different approach — they operate in the CBRS band, which is shared spectrum that doesn't conflict with altimeters at all. Luna: So the public 5G network has to be careful, but a private network on the airport grounds can use cleaner spectrum. That makes sense. Lucas: And it's not just Denver. Atlanta Hartsfield-Jackson, Chicago O'Hare, and Dallas-Fort Worth are all in various stages of testing or deploying private 5G for ground operations. The FAA has a program called the Airport Surface Surveillance Capability, or ASSC, that explicitly includes cellular-based solutions as an alternative to radar. They've certified at least two vendors — one using 5G, one using Wi-Fi 6 — to sell into that program. Luna: So this is becoming a new revenue stream for the carriers too. They get to sell private network equipment and services to airports. Lucas: Absolutely. Verizon has a dedicated business unit called Verizon Aviation. AT&T has their 'Private 5G for Airports' offering. They're not just selling connectivity — they're selling the whole sensor network, the edge computing that processes the location data, and the dashboard that the air traffic controllers use. One contract for a large hub can be worth tens of millions of dollars. Luna: Now, when you say 'edge computing' — is that because the latency needs to be so low that you can't send the data to a cloud center somewhere? Lucas: Exactly. If a tug is moving at 30 miles per hour and a controller needs to know its position to within a foot, you can't have a round trip to a server farm in Virginia. The processing has to happen right there at the airport. So each base station has a small computer running the positioning algorithm locally, and it sends only the aggregated tracks to the tower. That's the edge. Luna: And this ties into the broader push for 'digital twins' of airports — where you have a real-time simulation of everything happening on the ground, which you can use to optimize taxi routes, predict congestion, even automate some ground movements. Lucas: That's where it gets really interesting. A few airports are already experimenting with digital twins — Singapore Changi and London Heathrow come to mind. They're using 5G networks to feed sensor data into a simulation that runs continuously. The controller can see not just where planes are, but where they'll be in five minutes if they follow the current path. And if there's a conflict, the system suggests an alternative taxi route. Luna: So instead of the controller having to visualize everything in their head, the computer does it. Lucas: Exactly. And here's a number that sticks with me: the FAA says runway incursions — instances where an aircraft or vehicle gets too close to another — happen about once a day on average across US airports. Most are minor, but the potential for disaster is always there. Better surveillance could cut that number significantly. Luna: If today's conversation gave you something useful — maybe a new understanding of how airports are getting smarter — there's a way to keep these episodes ad-free and focused on the tech itself. It's listener support that makes that possible, at buy me a coffee dot com slash fexingo. Lucas: And that support is what lets us dig into these niche angles that a general news show wouldn't touch. So if you value that, it's a simple way to help. Now, back to the runway — there's another layer to this that I think is even more forward-looking. Luna: What's that? Lucas: The concept of 'follow-me' vehicles. Right now, when a plane lands and needs to taxi to a gate, a 'follow-me' car drives ahead of it to lead the way, especially in low visibility. Those are human-driven. But with a precise 5G positioning network, you could automate that — have a self-driving ground vehicle that leads the aircraft to the gate, transmitting its position continuously. Luna: That would save labor costs and improve consistency. But you'd need extremely reliable positioning — if it fails, the pilot could get confused. Lucas: Right, and that's why it's still in research. But at Munich Airport, they've been testing an autonomous snowplow that uses a private 5G network to navigate the taxiways. The plow knows exactly where it is, and the tower knows exactly where the plow is. They've been doing that for two winters now. Luna: So the same technology that helps in good weather helps even more in bad weather — when you can't see. That's the real value proposition. Lucas: Exactly. And it's not just snow — fog, heavy rain, nighttime operations. The current radar-based system degrades in heavy rain, actually. 5G doesn't have that problem because it's using a different frequency and technology. So it's both more precise and more reliable in adverse conditions. Luna: Is there any pushback from the air traffic controllers' union? They might see this as a threat to their jobs. Lucas: Interestingly, the National Air Traffic Controllers Association has been supportive — publicly, at least. Their argument is that better situational awareness reduces stress and fatigue. Controllers still make the decisions; the system just gives them better data. So instead of staring at a radar blip that updates every few seconds, they see a continuous track with the vehicle's ID, speed, and heading. That makes their job easier, not obsolete. Luna: And it also helps with the looming shortage of air traffic controllers. The FAA has been struggling to hire and train enough people. If you can make each controller more efficient by giving them better tools, you can handle more traffic with the same number of people. Lucas: That's a huge point. The FAA's own estimates say that by 2029, they'll be short about 1,200 fully certified controllers. Tools like 5G surface surveillance are part of the answer. It's not a silver bullet, but it's a meaningful piece. Luna: So, to sum up: 5G private networks are not just for factories and hospitals — they're being deployed on airport runways to track every vehicle in real time, reduce delays, and prevent incursions. Denver saw 17 percent fewer taxiway delays. The FAA is mandating this technology by 2026. And companies like Verizon and AT&T are building entire business units around it. Lucas: That's the picture. What I find striking is that this is a case where the private network model — dedicated spectrum, edge computing, custom sensors — is actually out-innovating the public mobile network. It shows that 5G's killer app might not be faster video on your phone, but invisible infrastructure that makes the physical world work better. Luna: And we don't even see it. The next time I'm sitting on a plane waiting to take off, I'll think about the 5G base stations under the runway lights. Lucas: They're out there. And they're quietly making the whole system safer.