Hub-and-spoke vs. point-to-point: comparing airline network models

If you spend one morning at Frankfurt Airport and another at Charleroi Airport, you see two completely different worlds: here waves of long-haul jets and feeders at minute intervals, there a rhythm of low-cost jets, mainly Ryanair Boeing 737s, that arrive, turn around and leave again. Behind this are two network models – hub-and-spoke and point-to-point. Anyone who understands them also understands why all hell breaks loose at some airports at eleven o’clock and nothing happens at twelve, and why budget airlines almost never guarantee connecting flights.

Hub-and-spoke and point-to-point: the short answer

With the hub-and-spoke model, an airline organizes its network like a bicycle wheel: in the middle is the hub, outside are the many cities connected to it via spokes. Anyone who wants to get from one spoke to another changes planes at the hub. With the point-to-point model, this center does not exist as a business foundation. The airline flies routes directly between two cities, and each of these routes has to fill up with passengers who want to go exactly there.

Neither model is a matter of faith; both are answers to an economic question: how do I connect as many places as possible with as few aircraft as possible, without flying empty seats around?

The math behind the hub

The core of the hub model is simple combinatorics. If you want to connect n cities so that each is directly connected to every other, you need n × (n − 1) / 2 routes. With ten cities, that is 45; with fifty cities, already 1,225. If you instead designate one city as the hub and connect all the others only to it, you need n − 1 routes – nine for ten cities.

The trick: every flight to the hub carries not only passengers who stay in the hub city itself but also everyone continuing from there in dozens of other directions. A feeder route from a mid-sized city that could never fill a long-haul flight to Asia on its own thus supplies part of the passengers who board the widebody at the hub. Only this bundling makes many long-haul connections economical in the first place.

The price of bundling

The flip side: passengers fly detours and lose time connecting. The airline needs a lot of infrastructure, staff and slots at the hub, and a problem there – thunderstorm, strike, capacity bottleneck – spreads across the whole network. How tightly connection times are calculated and what happens with missed connections, you can read in the article Connecting at a hub.

How hub-and-spoke became big

Until 1978, the Civil Aeronautics Board largely regulated in the US which airline could fly which routes. Networks therefore consisted mainly of direct connections. Delta Air Lines is considered the pioneer of the hub model: even before deregulation, it built Atlanta into a junction through which it linked smaller cities in the South. With the Airline Deregulation Act of 1978, airlines were free to design their networks – and many then built hubs of their own.

Today, Atlanta Airport is the prime example of a so-called fortress hub: most of the traffic there runs through Delta Air Lines. You find similar structures at American Airlines in Dallas/Fort Worth or at United Airlines in Chicago O’Hare.

In Europe, the big network airlines emerged from the former state airlines, which were oriented toward their capital-city airports anyway. The Lufthansa Group uses Frankfurt and Munich as hubs, Air France-KLM Paris Charles de Gaulle and Amsterdam Schiphol. The most extreme form of the hub model is shown by the Gulf airlines: Emirates in Dubai and Qatar Airways in Doha live to a large extent from letting passengers connect between Europe, Asia, Africa and Australia. How this business model works in detail is explained in the article on the Gulf airlines.

How point-to-point works

Point-to-point is the older and actually more intuitive model: an airline flies from A to B because enough people want to go from A to B. In its modern form, it grew big with the low-cost carriers. Southwest Airlines is considered the role model in the US; in Europe, Ryanair, easyJet and Wizz Air have adopted and developed the principle.

Typical of point-to-point airlines are:

• Bases instead of hubs: Aircraft and crews are stationed at a base and fly several rotations from there during the day to different destinations. The base, however, is not a connecting node.
• Short turnaround times: Because no connection has to be waited for, the aircraft turns around as fast as possible and flies more rotations per day.
• Uniform fleet: A single aircraft family saves costs on training, maintenance and spare parts – the Boeing 737 at Ryanair, the A320 family at easyJet and Wizz Air.
• Secondary and regional airports: Lower fees and free capacity make airports such as Brussels Charleroi or Frankfurt-Hahn attractive.
• No connection guarantee: If you miss your second flight because the first was delayed, that is usually your problem – each booking stands on its own.

The article How budget airlines work describes this in more detail. One advantage for the airline lies in robustness: if a flight is delayed, nobody misses a connection, and the delay does not propagate across an entire hub. On the other hand, a network without a central node can be hard to manage in major disruptions, because aircraft and crews are spread over many places.

The two models compared directly

Feature	Hub-and-spoke	Point-to-point
Network structure	star-shaped around one or more hubs	many direct routes between city pairs
Typical airlines	network airlines, Gulf carriers	low-cost carriers, leisure airlines
Connecting	core of the business model, connections guaranteed	rare, usually at your own risk
Fleet	mixed, from regional jet to widebody	often a single aircraft family
Ground times	longer, coordinated with connections	as short as possible
Long-haul	very feasible thanks to feeder traffic	difficult, only with a lot of local traffic
Vulnerability	problems at the hub hit the whole network	delays tend to stay local
For passengers	many destinations with one connection	fast direct flights on strong routes

The gray zone: hardly any airline is pure

In practice, the models have been blending for years. A few examples:

• Network airlines also fly direct. Through Eurowings, the Lufthansa Group serves many direct routes from airports such as Cologne/Bonn that are not meant as hubs at all.
• Secondary hubs. When a main hub hits its capacity limits, an airline often builds a second one. For Lufthansa, Munich is such a second pillar alongside Frankfurt.
• Focus cities. Some airlines have airports with many of their own flights, which mostly carry local traffic – this lies between base and hub.
• Low-cost with a connecting product. Some budget airlines now sell itineraries with a connection at their biggest bases without becoming a network airline.
• Alliances and codeshares. Through Star Alliance, oneworld and SkyTeam as well as codeshare flights, partners feed each other’s hubs – a point-to-point flight of one partner can thus become part of a connecting itinerary.

New aircraft shift the boundaries

Technology also influences which model pays off. Large four-engine jets such as the Boeing 747-400 or the Airbus A380 depend on many passengers and therefore fit large hubs well. Efficient twin-engine long-haul jets such as the Boeing 787-9 or long-range narrowbodies such as the Airbus A321XLR, on the other hand, make even smaller direct connections over long distances economically conceivable. That does not replace hubs, but supplements them with more direct routes that were previously only possible with a connection.

What the network model means for you at the fence

For spotters, the network model is more than business administration – it determines what shows up in front of your lens and when.

At a hub: think in waves

Many hubs work with arrival and departure waves, known in industry jargon as banks. First a batch of long-haul and feeder flights lands, then comes a phase in which passengers connect, and after that the next wave takes off. For you, that means: in one hour, more can be going on than in the three hours before. Anyone who knows the waves plans their visit around them – more on this in the guide Understanding and using hub waves. Especially in the morning, the long-haul flights from Asia and North America bring the big widebodies; when they typically arrive is shown in the article When long-haul flights land in Europe.

Hubs also have the greatest variety of types: regional jets and turboprops on the feeders, narrowbody jets on continental traffic, widebodies on long-haul and, on top of that, the alliance’s partner airlines. For places such as the Zeppelinheim viewing platform in Frankfurt or the Munich Airport visitors’ hill (Besucherhügel), that means: plenty of variety, but also downtime between the waves.

At the low-cost base: rhythm instead of peaks

At airports with many point-to-point flights, traffic is often steadier, with a strong peak early in the morning when the stationed aircraft set off on their first rotations and late in the evening when they return. The variety of types is smaller, but it pays to look at the details: registrations, special liveries, leased and wet-leased aircraft or aircraft from other bases standing in as replacements. How to put such finds in context is described in the article How rare is my sighting?.

The schedule itself also changes with the season: point-to-point airlines often rework their networks considerably between summer and winter, because vacation routes drop out or are added. How the system works is explained in the article on the summer and winter schedule.

Common misunderstandings

• “A base is the same as a hub.” No. At a base, aircraft are stationed; at a hub, passengers systematically connect. Ryanair has many bases but no classic hub.
• “Point-to-point is always cheaper.” For the airline, it is often cheaper to operate. Whether your ticket is cheaper depends on route, timing and competition.
• “Hubs are a dying model.” Despite new direct routes, the hub remains central for long-haul and thin connections. The big network airlines continue to rely on their hubs.
• “Charter is point-to-point.” Mostly yes, but charter is a marketing model, not a network model. The difference is explained in the article Charter and scheduled flights.

Conclusion

Hub-and-spoke and point-to-point are two answers to the same question: how does an airline get as many people as possible to their destination with as little effort as possible? The hub bundles traffic from many directions and thus makes long-haul and small destinations economical, but pays with detours, waiting times and vulnerability. Point-to-point relies on direct flights, fast rotations and simple fleets but needs enough demand of its own on every route. In reality, most airlines fly a mix – and for you as a spotter, the model explains why Frankfurt breathes in waves and a low-cost base in the beat of its stationed jets.