Plovdiv There are also playgrounds for children. It is popular among the citizens and guests of Plovdiv who use it for jogging, walking, and relaxation. Plovdiv Stadium (55,000 seats) is the largest football venue in Bulgaria. Other stadiums include Stadion Botev, Lokomotiv (10,000 seats), Maritsa Stadium (5,000 seats), and Todor Diev Stadium (7,000 seats). There are seven indoor sports halls: Kolodruma, University Hall, Olimpia, Lokomotiv, Dunav, Stroitel, Chaika, Akademik, and Total Sport. In 2006, Aqualand, a water park, was opened near the city centre. Several smaller water parks are in the city as well. Football is the most popular sport in
Plovdiv Airport and Frankfurt) in 2015 after two years of stable operation. The government have started the first concession procedure back in 2011, but there were no candidates for it. The second attempt for the concession was made in the spring of 2016 when the government have opened a tender for a 35 years concession of the airport, but the tender was shortly cancelled for non-compliance with European rules. In December 2016 the government opened the 3-rd tender for the concession. In the new procedure 3 companies have made the bid for the airport - Silk Road Plovdiv Airport, Consortium Plovdiv Airport