The air fare depends on the flight date. The craft types to be used include Boeing 737, Boeing 747, Boeing 757 and European Airbus. Advance seat selection is not available at booking but when you change the boarding pass, you can tell the staff at counter your seat preference and they may meet your demand. Advance reservation in economy class is possible. This booking center can book the ticket for you. Please write to them at travelchinaguide.com|flight with your detailed schedule, number of your group and they will quote the best price for you.