Construction begins on Tallinn Tram Route 4 airport extension August 19, 2016 | Europe Company News A consortium of Estonia-based Merko Ehitus AS and Kmg Insenerehituse AS has begun construction of the 700-metre southern extension of tram Route 4 to the Lennart Meri airport in Tallinn. The extension... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password