Over the weekend, dozens of Barcelona’s bus and metro shelters were quietly turned into paper planes. By Tuesday, 16 September, the stunt had a name and a purpose: ‘Caiguda lliure’, ‘free fall’ a guerrilla campaign by the activist collective Agència pel Clima opposing plans to expand Barcelona–El Prat airport.
Organisers say more than 50 advertising panels were reworked to depict origami aircraft accompanied by the ‘free fall’ message, a visual metaphor urging a sharp reduction in flights. The intervention rolled out over several days before being publicly claimed on Tuesday to coincide with the International Day for the Preservation of the Ozone Layer. 
The timing is pointed. In June, the Catalan Government and Aena revived a contentious El Prat expansion, prompting renewed resistance from environmental groups. The proposal includes extending the third runway, with associated impacts on protected wetlands such as La Ricarda, a flashpoint during the fierce 2021 protests that stalled an earlier push. The latest plan has again mobilised a broad climate coalition across the Barcelona metro area. 
Beyond aesthetics, the action taps into a deeper urban anxiety. Campaigners argue that aviation growth is incompatible with climate targets and with a city already grappling with overtourism. Their social posts and local media briefings call for ‘drastic’ cuts to flights and a rethink of tourism’s environmental costs. Previous actions by the same network have targeted what they call ‘greenwashing’ in travel and hospitality advertising. 
City institutions, for their part, have spent years promoting climate adaptation and mitigation plans, while juggling economic arguments around connectivity, trade and jobs. That tension frames the latest intervention: an artful disruption pitched at everyday commuters whose shelters became the canvas. Whether it shifts the politics is an open question, but it has undoubtedly refuelled the El Prat debate at a moment when officials are selling expansion as strategic infrastructure. 
The symbolism of launching on ozone day is hard to miss. The date marks the 1987 Montreal Protocol that phased out ozone-depleting substances and is often cited as proof that coordinated international action works. Activists here are betting that the same urgency can be applied to aviation emissions, even as industry lobbyists argue that efficiency gains and sustainable fuels will square the circle. 
Conclusion: The ‘free fall’ campaign is a neat piece of climate theatre that turns street furniture into a referendum on flight growth. It might not ground planes, but it situates the airport expansion squarely in the public eye — on the very pavements where Barcelona’s daily life plays out.
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