A fight for the ownership of Hong Kong Airlines has been intensified by a new party claiming substantial interest in the company, as a government-imposed deadline to reveal who is in charge looms.Unknown entity Grand City Investment Capital (GCIC) said on Tuesday night that it had taken on “substantial indirect interest” in Hong Kong’s third-largest airline, and financial documents showed it had acquired the entire shareholdings of Frontier Investment Partner (FIP), which the airline’s former…