It seems that credit card is charged "directly when shipped" for pre-orders.
Check this (2012) post : https://forum.aerosoft.com/index.php?/topic/53585-aerosoft-download-shop-payments/&do=findComment&comment=365551
"Pre-orders paid by bank transfer:
If you pay via bank transfer you have the opportunity to pay the amount whenever you want. Once the Box has released you can pay the amount and the Box will be shipped as soon as the payment has been confirmed by the accounting department.
So this is like the customer posted in the Forum.
Pre-orders paid by credit card:
The invoice amount will be reserved in the moment the customer makes the pre-order of a not released product, but the credit card will not being charged until the Box has released. Actually the charge will be made on the day of shipment of the delivery.
Pre-orders paid by PayPal:
The amount will be charged directly when the pre-order has been made and after release the Box will be shipped immediately.
Pre-orders with payment after receipt:
We actually offer the bank transfer after receipt of product and the automatic debit transfer system for pre-orders, but this is just for domestic orders."