if you bought any of previous A320 professional series (a318/A319 or A320/A321 or A320 bundle) at our shop you are entitled to a 18 Euro discount, this will be automatically applied when you buy at the Aerosoft shop. If you do NOT see this discount do not buy and contact support@aerosoft.com. If you bought at other shops you might have to insert your previous serial, it depends on the shop.