Air freight also have Airway Bill of Lading(AWB), the different is original AWB will be shipped together with cargo to destination. That means will need to prepay the air freight cost before flight taking off, then we could release the cargo.
T/T ( Telegraphic Transfer) is the most used payment method.
For Alibaba overseas buyer, there some appointed countries could also pay via Alibaba.
Money Gram/Western Union is no more accepted by China forwarders due to the bank regulation more strict.
Paypal can only be used to accept small amount under $ 1000.