All four portfolio airports are certified by the Airport Carbon Accreditation Program, an independent certification system for airports introduced by the industry association ACI. It is the only institutionally-endorsed global carbon management certification program for airports. Using a multi-level certification system, it independently assesses greenhouse gas emissions of airports and measures taken to reduce them. Athens International Airport is currently certified at level 4+ (Transition), Hamburg Airport at level 3+ (Neutrality), Düsseldorf Airport at level 3 (Optimization) and San Juan Airport at level 1 (Mapping).

A key issue at Düsseldorf and Hamburg airports is supporting climate-friendly travel to and from the airport. Electric-drive sharing vehicles offer travelers a flexible mobility alternative that also consumes fewer resources. Düsseldorf Airport was the first German airport to offer all mobile sharing services such as e-cars, e-scooters and e-bikes in one place with the DUSsharing hub. Hamburg Airport is also setting a good example: There are a total of 120 parking spaces with charging points for electric car-sharing here. In terms of the extent of the charging infrastructure, there is no comparable mobility hub in Europe. 

The Greek capital's airport is one of the fastest growing airports in the world and also an industry leader when it comes to environmental protection: It was one of the first airports to invest in solar technology and establish its own photovoltaic park. The first plant, which feeds the electricity produced into the national grid, was inaugurated in 2011; another followed in 2023. Around two thirds of the electricity required by the airport company is already generated from renewable sources. In 2025, it is planned to commission a further plant, so that the company's entire electricity requirements can then be met by using solar energy. 

Under the motto "Fresh Woodland for North Rhine-Westphalia", AviAlliance, together with Düsseldorf Airport and the airline Eurowings, planted 2,500 trees in the neighborhood of the airport in 2023. This will enable an entire forest to grow there again in the coming years. The areas of fresh woodland store CO₂ in a natural way and at the same time supply oxygen. With this sustainable reforestation project, the company is actively committed to climate protection in the Düsseldorf region.

The signing of the "Toulouse Declaration" on 4 February 2022 represents an important commitment to decarbonize aviation in Europe. For the first time, European governments, the European Commission, the aviation industry, and other key stakeholders have formally agreed to decarbonize aviation by 2050. A significant role in promoting this initiative was played by airports in the industry association ACI EUROPE, including airports in which AviAlliance has a holding.  

In order to save energy, airports rely on modern, LED-based systems for the lighting of buildings, service roads and the airfield. In addition, they are increasingly using systems that switch lighting on only when people are present. Such measures significantly reduce energy requirements, as the large amount of lighting used at airports means there is great potential for savings. 

In order to achieve the goal of climate-neutral aviation, it is vital for the entire industry to be active and pool its efforts. The aviation initiative aireg (Aviation Initiative for Renewable Energy in Germany), an association of companies and organizations from industry, research and science, is committed to the availability and use of renewable energies in aviation in order to achieve the industry's ambitious targets for reducing CO₂. By becoming a member in the initiative, AviAlliance seeks to make an active contribution to this. 

Düsseldorf Airport is the largest airport in Germany's most populous federal state, North Rhine-Westphalia, and thus an important hub for international aviation. Accordingly, there is also a lot of traffic on the apron and on the runways. The gradual conversion of the airport's vehicle fleet to electric drives therefore offers great potential for CO₂ savings. Of the total of around 570 vehicles in the fleet, around 150 are already electric. By 2030, thanks to the continuous expansion of the charging infrastructure, 50 percent of light commercial vehicles and passenger cars are to have an electric drive, rising to 100 percent by 2045. 

Hamburg Airport is one of the oldest airports in Germany and its long history also means that it owns over 7.5 million square meters of forest. For many decades, the airport has been committed to the sustainable use and enhancement of these areas with the aim of creating and preserving a climate-stable forest and species-rich nature. Over the past 20 years, Hamburg Airport has planted almost one million trees. The forest is currently being extended by a further 50 hectares. The targeted selection of the tree species helps to make the forest resistant to climate change.