"Trace Group Hold" PLC designs, constructs and maintains military and civil airports.

In 2001 the company simultaneously carried out the design and construction of "Graf Ignatievo" Airport only for a period of three months. New technologies: production of poly-modified bitumen and application of polymer-modified asphaltic concrete, crack-dispersing geosynthetics and a state-of-art lighting system. Reconstruction was carried out under the requirements of ICAO and STANAG.

The company has entered into a contract for feasibility studies, design, implementation of new general construction work, reconstruction, restructuring, general and emergency repairs, including other necessary general construction work on the terriroty of Sofia Airport for the period 2013 - 2017.