History of Plovdiv plant for electrical apparata, tobacco plant, canning factory, motor-truck factory and many others. On 6 April 1956 the first trolleybus line was opened and in the 50s the emblematic Trimontsium Hotel was constructed. In the 60s and 70s there was construction boom and many of the modern neighborhoods took shape. In the 70s and 80s many antique remains were excavated and the Old Town was fully restored. In 1990 the Sports complex "Plovdiv" was finished. It included the largest stadium and rowing canal in the country. In that period Plovdiv became the birthplace of Bulgaria's movement for democratic reform, which
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,