AA Corporation is entitled to postpone the agreed date of delivery free of charge and liability by informing thereof at the latest seven (7) days prior to the agreed date of delivery.

AA公司有权在不承担费用和责任的情况下，最迟在约定的交货日期前提前7天通知对方推迟约定的交货日期。

youdao

Delivery is free of charge.

免费送货。

《牛津词典》

That's "cash on delivery." While the charge isn't strictly a tax, the alternative is (from the recipient's point of view) tax free.

由于这一费用并非严格的税费，另一种选择便是(从收件人的观点来看)免税。

youdao

To ensure quick delivery during a humanitarian crisis, the stoves are given free of charge to women.

FORBES: How A Market-Based Approach Can Solve A Humanitarian Problem In Darfur