Hong Kong, Aug. 2 -- Hong Kong Airlines permitted to grow regional frequencies after cancelling San Francisco service.

Hong Kong Airlines (HKA) will grow frequencies to existing destinations, an indication the airline is re-gaining the trust of regulators. Hong Kong's Transport and Housing Bureau (THB) is gradually easing restrictions that precluded the airline from adding flights. The measure was imposed after management changes, weak performance and public pressure on THB to have oversight.

The additional flights to existing destinations cover Haikou, Hangzhou and Sapporo. From September 2, there will be three daily flights to Haikou, the home of major shareholder HNA, which operates Haikou Meilan International Airport. From September 8...