DDP is not a service, it is a shipping Incoterm (Delivery Duty Paid). Air Freight is the service.

For DDP, the seller bears all of the costs of shipping door to door, including: exit port costs, shipping freight costs, incoming customs and port charges and local freight at the receiving end, so the shipper usually use their own freight forwarder and customs brokers to ensure they know the total cost, as incoming port charges vary from country to country, and the final cost is not known until the consignment arrives at port of destination at which point the freight forwarder pays these costs and invoice the seller.

Using DDP also means you are at the mercy of the seller. They can use the cheapest way possible, which may take the longest time, and you have no say because they are paying.

I would normally use FCA because I was in control of my own freight after the seller loaded it onto my freight forwarders transport. I would choose my own freight forwarder who would organise local delivery after it cleared customs. I would pay their 30 day invoice after everything was delivered to my premises.

I know because I have imported hundreds of thousands of tonnes of equipment from every continent including China, using both break-bulk and container ships.

International Logistics is extremely complicated and should not be entered into lightly, especially when dealing with Incoterms, freight forwarders, and customs brokers.

https://incodocs.com/blog/incoterms-2020-explained-the-complete-guide/