According to British consultants from Airport Strategy & Marketing, which were hired to investigate possibilities for developing new routes, there is big interest from low-cost carriers like Ryanair and Wizz Air. Despite that, Ryanair has ceased the flights on 2 routes (Milan 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 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, with Eurocopter AS 532, Mil Mi-24, Mil Mi-17 and Bell 206 units. Next to the airbase is the only functional aviation museum in Bulgaria. Opened in 1991, the museum has a rich collection of modern, cold war airplanes and such from the Third Bulgarian Kingdom. Due to the low state budget, the collection is preserved mostly by donations. The museum is accessible by car on the way to the airport and is about 100m from Mavrudovo railway station. Working hours for visitors are 9:00–16:00. The following airlines operate regular scheduled, charter, and seasonal charter flights at Plovdiv Airport: