Bulgaria's anti-trust authority has given the go-ahead for the signing of a concession deal with Fraport Twin Star Airport Management for the operation of coastal airports Burgas and Varna. The operator is controlled by Germany's Fraport which bid for the 35-year contract in partnership with Varna-based company BM Star. The concessionaire has vowed to inject 403 mln euro in the 2 airports during the lifespan of the arrangement.