Air China baggage allowance policies can be subject to change, and it's crucial to verify the latest information on their official website or contact their customer service for the most accurate and up-to-date details. However, I can provide a general overview based on common practices for international flights.

Checked Baggage: Air China's checked baggage allowances typically depend on the travel class. Economy Class passengers usually have a specific weight limit for their checked bags, while Business and First Class passengers may enjoy a higher allowance. The exact limits can vary depending on the route and fare type.

Cabin Baggage: For cabin baggage, international flights with Air China usually permit one piece for Economy Class passengers, and Business/First Class passengers may have a higher allowance. Cabin baggage dimensions and weight limits are standard considerations, and passengers are generally allowed one personal item in addition to their main cabin bag.

Excess Baggage: Exceeding the permitted baggage limits often results in excess baggage fees. Air China's fees can vary based on the route and the excess weight of the baggage. It's essential to be aware of these fees to avoid additional charges at the airport.

Special Items: Air China's baggage policy may include provisions for special items such as sports equipment or musical instruments. Different rules and fees may apply, and passengers should check the airline's guidelines for transporting such items.

Online Booking Discounts: Some airlines, including Air China, may offer discounts on baggage fees if passengers purchase them online during the booking process. This is a common practice to encourage online transactions and streamline the check-in process.

For the most accurate and up-to-date information on Air China's baggage policies, including any recent changes or specific details for your flight, it is strongly recommended to refer to their official website or contact their customer service directly. Airlines can update their baggage policies, and having the latest information ensures a smooth and well-prepared travel experience.