Air China baggage allowance for international flights typically includes one free checked bag for economy class passengers, with a weight limit of 23 kilograms (50 pounds) and maximum linear dimensions (length + width + height) of 158 centimeters (62 inches). Business and first-class passengers may receive higher weight allowances or additional bags. However, specific allowances can vary based on the route, ticket class, and frequent flyer status. It's recommended to consult Air China's official website or contact their customer service directly for the most accurate and current information regarding baggage policies for international flights.