The aircraft delivered yesterday will begin flight trials in the coming months.
The first P-8I recently completed testing its weapons capabilities, including successfully firing a Boeing Harpoon missile at a target and dropping a torpedo.
In order to efficiently design and build the P-8I and the P-8A, the Boeing-led team is using a first-in-industry, in-line production process that draws on the company's Next-Generation 737 production system, a media release said.