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January 2011, Boeing received a $1.6 billion contract for the low-rate initial production (LRIP) of the first 6 aircraft, including funding for spares, logistics, and training devices. In July 2013, Boeing was awarded a $2.0 billion contract by the U.S. Navy for 13 P-8As. The contract runs through April 2016. On February 25, 2014, Boeing was awarded a contract valued at $2.1 billion to build 16 P-8A Poseidons through April 2017.
In February 2014, the Government of Australia announced its decision to purchase eight P-8As + options for four additional aircraft in a $3.6 billion deal. The P-8A will replace Australia's aging AP-3C Orions. The first aircraft will be delivered in 2017 with all eight aircraft fully operational by 2021.
وده الرابط فيه بعض التفاصيل
http://www.bga-aeroweb.com/Defense/P-8-Poseidon.html