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 a tie-up between Hainan and Plovdiv Airport Invest. On 28 March 2018, Bulgarian Government awarded the consortium of HNA Group and Plovdiv Airport Invest a 35-year-long concession on Plovdiv airport in return for investments reaching €79 million, including a new cargo and passenger terminal. On 19 of July the consortium of HNA Group and Plovdiv Airport Invest have declared that it won't sign the concession contract which opens the road for the classified on the second place to take the concession. On the west side of the airport is located 24th Helicopter Air Base of the Bulgarian Air Force,