A narrow-body aircraft lands, taxis to its stand, and from that moment a race against the clock begins that almost no one sees. Over the following 30 to 40 minutes, ramp crews, fuel, catering, cleaning, baggage, passengers and, often, line maintenance, among others, must come together without friction and in the right order. If any of these actors arrives late or crosses paths with another, the aircraft misses its departure slot, and that delay, multiplied across hundreds of daily operations, is real money sitting idle on the tarmac.
For years, the conversation about airport efficiency revolved almost exclusively around the air: runway capacity, arrival sequencing, airspace modernization. That agenda remains alive and necessary. But as the world's fastest-growing airports approach the physical limits of their runways (or simply cannot expand them at the pace demand requires), the next great pocket of efficiency is no longer in the sky: it is on the ground, in the few hundred square meters where the aircraft stands between one flight and the next.
A system played out in minutes, not hours
The economic logic is more compelling than it first appears. Every minute a narrow-body aircraft spends on the apron carries a cost on the order of 300 to 400 dollars, between the aircraft's capital cost, crew, and lost flying opportunity. Take a public case to put the order of magnitude in perspective: Monterrey International Airport in Mexico, which, according to figures its operator, OMA, made public in 2026, handles more than 130,000 aircraft operations and 16 million passengers a year. Capturing just one minute of efficiency on a quarter of those operations (the kind of result typically achieved through low-cost process measures, with no civil works whatsoever) already represents a value of $9.75 to $ 13 million a year. Scaling that figure up with a more ambitious intervention that combines process, governance, and technology can push that number far higher.
The problem is global and well documented. ICAO estimates that surface operations at airports generate about 5 million metric tons of CO2 annually, with close to 30% coming from avoidable taxiing holds. Worldwide, up to 37% of taxi time is still flown with one engine shut down (a fuel-saving practice whose adoption remains uneven), and fuel now accounts for between 25% and 30% of an airline's operating costs. In that context, every minute of apron or taxi time recovered is not an operational nicety: it is margin.
It is worth pausing for a moment on where the 300-to-400-dollar figure comes from, because it is neither arbitrary nor overstated. The “textbook” direct operating cost of a narrow-body (fuel, crew, maintenance, and the prorated lease of the aircraft), which the industry today places at 85 to 140 dollars a minute, is in fact noticeably lower. The difference is not a calculation error: it reflects that the critical minute on the apron does not stay isolated, but propagates, generating a far-from-negligible multiplier effect.
The reference literature on delay economics (the framework developed by the University of Westminster for EUROCONTROL, and the influential FAA study in the United States on the total cost of delay) documents precisely that network effect: a delay that originates in an aircraft's first rotation of the day cascades into that same aircraft's subsequent rotations and into its passengers. At a nationwide scale, that FAA study quantified the phenomenon at 8.3 billion dollars a year in costs to airlines, 16.7 billion to passengers, and a further 3.9 billion in lost travel demand (nearly 29 billion dollars a year in the United States alone), with every additional minute of average delay raising the entire industry's variable costs by 0.6%. But the most revealing figure is not the average: passengers who suffer a missed connection or a cancellation accumulate an average delay of 457 minutes, versus just 16 minutes for those unaffected (29 times more). The real cost of a minute of grounded aircraft does not live in the average: it lives in the few cases where that minute turns into a cascade.
It is also worth being precise about what tightening those times actually means. It is not enough to keep the aircraft from waiting with its engine running at the holding point before departure. Above all, it means reducing the total time the aircraft remains stopped on the apron with its engine off: the 30 to 40 minutes of the turnaround choreography described further below. Both stretches (engine off on the apron and engine on during taxi) consume budget, capacity, and passenger patience alike, and can only be resolved jointly, by coordinating apron and tower as a single system rather than as two worlds that simply hand the aircraft off to one another.
Building capacity is not the only lever available
Global air traffic keeps growing, and more and more airports (particularly in fast-moving emerging markets) are considering physical expansion to absorb that demand: more contact stands, more taxiways, additional terminals. That ambition to grow is legitimate and, in many cases, necessary. But it is worth bearing in mind that, alongside committing to that investment, there is an efficiency margin that is rarely quantified with the same rigor as a construction project: process, coordination, and technology improvements that, without pouring a single slab of concrete, allow airports to “scrape” non-trivial percentages of capacity and savings; and that amount, moreover, to a rare win-win for the whole industry: the airport gains capacity, the airline gains fleet and fuel efficiency, the passenger gains punctuality, and the environment gains lower emissions.
Experience shows that much of that margin does not depend on a construction project, but on better orchestrating what already exists: the same actors and the same infrastructure, but coordinated through data, standardized processes, and an operational governance model that, at many airports, still does not exist in explicit form.
The invisible choreography of the turnaround
Anyone who has not worked in airport operations tends to underestimate the complexity of those 30 to 40 minutes on the apron. It is not a linear sequence but a mesh of dependencies: baggage cannot be loaded until the arriving load is unloaded; fueling cannot run in parallel with certain catering operations for safety reasons; cleaning needs its own exclusive window; and all of it must be finished before the crew requests pushback, which is when the control tower and taxiway availability come into play. A single link that slips by five minutes desynchronizes the rest of the chain, and that slippage cascades to the next flight, and the next, which is why apron efficiency is not an isolated technical issue but one of the main enablers of an airport's overall performance: it directly drives airline fuel consumption, the quality of service perceived by passengers, operational safety in one of the busiest areas of people and vehicle traffic at the airport, and the apron's effective capacity to absorb traffic growth without additional investment.
Specialization becomes inevitable: separating tower and apron control
This dual requirement, tightening engine-off time and engine-on time at once, also explains a regulatory trend already visible in the United States: at airports with the highest volumes of operations, the FAA has increasingly been requiring that apron control be separated from air traffic control tower control, supported by dedicated apron-management services (ramp towers) that already operate alongside the tower at several of the country's largest airports.
The underlying reason runs through this entire article: as traffic grows, ever-greater specialization is needed (a controller dedicated exclusively to the choreography of the apron, with its own protocols and its own supporting technology) to achieve ever-tighter waiting times without taking capacity or attention away from the tower's runway operation. It is the same choice, a Remote Surface Control (ATS) model versus an Apron Management Service (AMS), per ICAO's Doc 9137, that many mid-size, growing airports face today, and it illustrates that operational specialization, far from being an organizational whim, is a direct response to the need to tighten times across the aircraft's entire cycle, not just one leg of it.
From A-CDM to computer vision: the levers that already work
The good news is that the world is no longer experimenting with these solutions: it is deploying them at scale. Airport Collaborative Decision Making (A-CDM), now fully implemented at Europe's main hubs and at more than twenty Chinese airports, synchronizes tower, apron, airlines, and handlers in real time around shared reference times (TOBT, TSAT, TTOT), replacing improvisation with a sequence that is agreed upon and visible to every actor.
Building on that foundation, artificial intelligence and video analytics are taking turnaround oversight to another level. Cameras and computer-vision models over the apron automatically detect every milestone in the process (arrival of the stairs, start and end of fueling, closing of the cargo holds) and predict the actual departure time with growing precision, enabling management by exception rather than manually watching every stand. Changi, one of the world's most advanced airports in this respect, estimates that AI-based turnaround optimization will allow it to run up to 12 additional turnarounds a day once fully deployed across the facility. At Seattle-Tacoma, smart monitoring of ground power unit use versus the aircraft's auxiliary power unit has cut CO2 emissions by 1.5 million kilograms a year, and IoT sensors connected to jet bridges and ramp equipment are delivering downtime reductions of up to 33% for that equipment at the most advanced facilities.
Adding to this is a third layer, still nascent but growing fast: the physical automation of the ramp itself, autonomous pushback vehicles, driverless baggage tractors, automatic detection of foreign object debris (FOD), which is beginning to move out of the pilot phase at reference airports and, over the next decade, will substantially change the way an apron is operated.
More than technology: the real change is also cultural
None of these levers (not the best video-AI camera, not the best-designed A-CDM system) delivers its full value unless it comes with a change in how the teams working around the aircraft operate. The apron is not an engineering problem solved once: it is a human interaction repeated dozens of times a day among people from different companies (handler, airline, airport, tower) who rarely sit down together to analyze why coordination breaks down at certain moments. Those moments are not random: they cluster, predictably, around the morning start of operations, when the entire apron wakes up at once; around the evening close of operations, when fatigue and the rush to finish the day breed shortcuts; and during peak hours, when several simultaneous turnarounds saturate the same ramp teams.
This is why the work of a consultancy like ALG does not end with technical diagnosis or a technology recommendation: it includes training the operational teams and, above all, repeatedly analyzing how those teams interact, flight after flight, during the day's most demanding moments. Changing habits (discipline in following procedures, the way a handler warns a controller of a five-minute delay, the ease with which a ramp team reports a deviation instead of hiding it) is often the highest-impact, lowest-cost lever of all, and also the hardest to sustain over time without explicit training and constant measurement of teams' actual behavior, not just of the systems.
The underlying lesson: no two airports are alike
Even so, none of these levers (technological, cultural, or regulatory) solves anything on its own if applied without specific judgment. Experience across airports of very different profiles shows that there is no single combination of solutions valid for every case: it depends on each apron's physical configuration, the applicable regulatory model, and the current maturity of operational processes. That is why, before committing significant investment to any single lever, it makes strategic and financial sense to first invest in precisely understanding where each airport stands today and what sequence of solutions maximizes its return.
The role of a strategic and technology consultancy kike ALG
This is where a consultancy with a systemic view delivers value that no single technology can provide on its own. It is not about selling a product, but about diagnosing with evidence, designing a focused set of alternatives with their explicit advantages and drawbacks, benchmarking the expected result of each against comparable airports internationally, and identifying the near-zero-cost quick wins that capture much of the benefit even before deciding on the structural levers; all of it accompanied by the training and human support that sustain change over time.
Over the past two decades, ALG has been at the center of this transformation: actively contributing to the development of operating models now recognized worldwide such as A-CDM, Total Airport Management, the Airport Operations Plan, and Airport Operations Centres; designing and implementing these models at airports across Europe, Latin America, and the Middle East; and supporting airport operators and airlines in adopting artificial intelligence and video-analytics solutions for real-time operational oversight. That combination of airport operational judgment, technical capability in data and AI, and support for teams through change is precisely what turns a diagnosis into an executable roadmap, and a roadmap into measurable results.
Because, in the end, the question every growing airport should be asking is not whether it will operate under greater pressure on its apron (that is already happening) but whether that pressure will be managed with evidence and clear priorities, or reactively, minute by minute, aircraft by aircraft.
At ALG we are a strategic consultancy specialized in transport, infrastructure, and logistics, with more than two decades of experience supporting airports, airlines, and air navigation service providers in modernizing their operations. We diagnose, design alternatives, quantify their impact, and build, together with our clients, the implementation agenda that turns every minute recovered on the apron into real airport capacity. We are ready to support airports and operators at any stage of this journey.
