The Hungarian state has acquired an 80% stake in the operating company of Budapest’s international airport, the National Economy Ministry said late Thursday. After several years of talks with the previous majority owner, Dusseldorf-based AviAlliance, the purchase agreement has been signed, the ministry said. The French infrastructure group VINCI acquired the remaining 20% stake in Budapest Airport Ltd, the operator company of Budapest Ferenc Liszt International Airport. The ministry put the total value of the transaction at €3.1 billion ($3.3 billion). “Ownership of the airport is a sovereignt…