People would rather pay more than fly less: implications for aviation decarbonisation

The sky is filling with planes, and with them, a growing contribution to global warming. Aviation is one of the hardest sectors to clean up because the technology to replace jet fuel with electricity or hydrogen is not ready for widespread use by mid-century. To reach climate goals, the world will need to either make flying significantly more expensive to fund cleaner fuels or ask people to fly less. For years, policymakers have operated on a hopeful assumption: that passengers are willing to pay a higher price for their tickets to keep the skies green, rather than giving up their trips. But this idea has never been rigorously tested against the alternative of simply cutting back on travel. The question is not just about economics, but about human nature and fairness. When faced with a choice between opening a wallet or closing a suitcase, what do people actually choose, and does it matter who pays the bill?

A team of researchers from institutions in Switzerland, the United Kingdom, and Germany set out to answer this by asking thousands of people directly. They conducted a large-scale experiment involving 3,454 participants from the United States, Switzerland, and China. The goal was to see how different ways of distributing the cost of decarbonization would affect people's willingness to pay more for a ticket versus their willingness to fly fewer times. The researchers did not just ask for a simple yes or no; they presented four distinct scenarios for how a new fee or a new limit on flying could be structured. One scenario applied a flat fee to everyone equally. Another charged based on a person's income. A third targeted frequent flyers with higher costs, and a fourth focused specifically on tourism flights. They also tested the reverse: instead of charging money, they proposed limits on how many flights a person could take, using the same four logic patterns.

The results revealed a clear and consistent preference across all three countries. When given the choice, people were markedly more willing to pay extra money than they were to fly less. On a scale measuring willingness, the average person expressed a moderate readiness to pay higher ticket prices, but their willingness to reduce the number of flights they took was significantly lower. This gap held true regardless of how the policy was framed. Even when the researchers tried to make the policies seem fairer by targeting the wealthy or the most frequent travelers, the general public did not become more eager to cut back on their travel. In fact, no single design for limiting flights managed to raise the public's willingness to change their behavior above the baseline level of doing nothing.

The study also uncovered a surprising driver behind these decisions. In many other areas of climate policy, people often care deeply about whether a burden is shared fairly across society as a whole. Here, however, the most powerful factor was personal fairness. People cared much more about how a policy affected them individually than about how it affected the group. If a plan looked like it would cost them personally, they rejected it, even if it seemed fair to everyone else. For instance, frequent flyers and business travelers strongly opposed policies that targeted them directly, such as fees based on income or limits on the number of flights they could take. They preferred a uniform fee that applied to everyone equally, which spread the cost out. Conversely, those who flew less or not at all were more supportive of policies that targeted frequent flyers.

The researchers found that the only group willing to break this pattern of self-interest were those with a deep personal concern for the climate. These individuals showed a higher baseline willingness to reduce their flying, regardless of the specific policy design. However, even for this group, the specific way a policy was framed did not significantly change their behavior. The study suggests that while people are generally resistant to flying less, they are surprisingly open to paying more, provided the cost is passed through uniformly. This finding challenges the idea that complex, targeted taxes or strict flight quotas are the best way to gain public support for cutting aviation emissions. Instead, the path to political viability may lie in simpler, uniform price increases that allow the market to absorb the cost of cleaner fuels, rather than trying to force a reduction in the number of trips people take.

The experiment was designed to be as realistic as possible without being a real-world mandate. Participants were shown hypothetical scenarios where they had to imagine a new fee on their ticket or a new limit on their travel. They were then asked to rate how fair the plan was to them personally and to society as a whole, and finally, how willing they would be to accept it. The researchers controlled for variables like income, how often people flew, and their general concern for the environment. They found that the country of origin made very little difference; the preferences in the US, Switzerland, and China were remarkably similar. The only exception was a slight difference in the baseline willingness to change behavior, with American respondents showing a bit more openness to reducing flights than those in the other two countries, but the overall pattern remained the same.

One of the most striking aspects of the study is what it ruled out. The researchers tested whether making the policy seem more "fair" to the group would make people more willing to accept it. They found that it did not. A policy that was perceived as very fair to society at large did not increase the willingness to fly less if it felt unfair to the individual. This contradicts a common belief in climate policy that emphasizing collective justice can overcome personal resistance. The study also found that the specific amount of emissions a policy would save did not change people's minds. Whether a plan promised to cut emissions by 15 percent or 45 percent, the willingness to pay or fly less remained largely the same. This suggests that the emotional and practical reaction to the policy itself is more important than the technical details of the environmental benefit.

The implications for the future of aviation are significant. The industry and governments have long debated whether to focus on supply-side solutions, like making cleaner fuel, or demand-side solutions, like asking people to fly less. This research suggests that trying to force a reduction in demand through strict limits or targeted taxes is likely to face stiff public resistance. People simply prefer to keep flying and pay the price. The most politically viable path forward appears to be a system where the cost of decarbonization is added to the ticket price for everyone, rather than trying to cap the number of flights or target specific groups. While this approach may not satisfy everyone, particularly those who fly frequently, it aligns with the public's actual preferences. It offers a way to fund the transition to sustainable aviation fuels without triggering the backlash that comes from asking people to give up their travel plans.

The study does not claim that this is the perfect solution, only that it is the one people are most likely to accept. The researchers noted that while people are willing to pay more, their willingness is not unlimited, and it is driven by a sense of personal fairness. If a policy feels like it is punishing them unfairly, even a small cost increase could become a dealbreaker. Furthermore, the study acknowledges that while people say they are willing to pay more in a survey, real-world behavior can be different. People might say they are okay with higher prices, but when the bill arrives, they might choose to stay home. However, the consistency of the results across three very different countries suggests that this preference for paying over flying less is a robust human tendency, not just a local quirk.

Ultimately, the research paints a picture of a public that is pragmatic rather than idealistic about aviation. They understand that the skies need to be cleaner, but they are not ready to sacrifice their mobility to get there. They are willing to contribute financially, but they want the rules to be simple and applied equally. For policymakers, the message is clear: if the goal is to decarbonize aviation without losing public support, the strategy should focus on making the cost of flying reflect its environmental impact, rather than trying to limit the number of flights. The path to a greener sky may not be through fewer trips, but through a fairer price tag.