China’s HNA Group—parent of Hainan Airlines—has completed an 82.5% stake purchase in Frankfurt-Hahn Airport to facilitate its European expansion. The transaction is worth €15.1 million ($15.8 million).

In March, HNA Group won the stake, which was owned by the airport’s federal state owners Rhineland Palatinate following European regulatory approval.

HNA Group said the company has received subsidies, including €25.3 million approved by the European Union, for this deal.

As Frankfurt’s second biggest airport, Hahn is used mainly by freight and low-cost carriers, with Ireland’s Ryanair and Hungary’s Wizz Air its two largest operators.

According to Reuters, HNA Group also plans to join the bid for Belgrade Airport’s 25-year franchise rights.

HNA Group currently controls 13 domestic airports—including Haikou Meilan International, Sanya Phoenix International, Yichang Sanxia and Anqing Tianzhushan.

The HNA-Hahn airport deal is the latest in a series of overseas aviation acquisitions:

•    In July 2016, HNA Group increased its stake from 61.7% to 96.1% in Swiss airline catering and logistics services company Gategroup.

•    HNA Group plans to take a 23% shareholding in TAP Portugal, with a bond buy from Azul Brazilian Airlines, in a $33 million transaction.

•    HNA Group subsidiary HNA Aviation bought an 80% stake in Zurich-based maintenance organization SR Technics from its previous sole shareholder, Abu Dhabi’s state investment and development vehicle Mubadala.

•    In May 2016, HNA Group announced plans to invest A$159 million ($114 million) to buy a 13% stake in Virgin Australia.