Air China's (SHA:601111, HKG:0753) passenger capacity slipped 0.9% year over year to 31.1 billion available seat-kilometers in January, according to a Friday filing with the Hong Kong Stock Exchange.

The airline logged a passenger count of 13.3 million, up 1.2% from the year-ago period.

Cargo capacity declined 3.9% to 1.16 billion available freight ton-kilometers, while cargo carried slid 3.1% year over year to 125,979.6 tons.