Plovdiv has one of the country's largest economies and contributes 7.5% of Bulgaria's GDP . In 2014, more than 35 thousand companies operate in the region which create jobs for 285,000 people. The advantages of Plovdiv include the central geographic location, good infrastructure, and large population. Plovdiv has international airport, terminal for intermodal transport, several connections with Trakia motorway (connecting Sofia and Burgas), proximity to Maritsa motorway (the main corridor to Turkey), and well-developed road and rail infrastructure which all led to the development of the city as the leading city in terms of industrial output in Bulgaria. The economy of
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