AviAlliance currently holds a stake of 55.44 percent in Budapest Airport, Hungary's most important international airport. In June 2007, AviAlliance, together with its consortium partners, had initially assumed responsibility for the airport management with a stake of 75 percent minus one vote. In July 2011, they also acquired the 25-percent stake of the Hungarian state. Since then, Budapest Airport is fully privatized. In 2019, 16.2 million passengers used the Hungarian capital's airport; in 2022, the number of passengers totaled 12.2 million.

Budapest Airport is one of the most dynamically developing airports in the region and continues to invest in expansion and modernization. In 2020, a new pier was opened to provide passengers with an even more pleasant and comfortable stay. The construction of Pier 1 represented a total investment volume of 33 million euros. 2019 had already brought the completion of the BUD Cargo City. This 50-million-euro project not only creates a first-class logistics base, but also enables the airport to become the central hub for air cargo in Central and Southeastern Europe.

In 2023, Budapest Airport was honored with the Skytrax World Airport Award as the best airport in Eastern Europe for the tenth time in a row. The Skytrax Awards are one of the most prestigious awards in the aviation sector. The awards are presented annually on the basis of an independent passenger survey, in which passengers are asked about their satisfaction with airport services, check-in and the quality of passenger services and security standards.