Top 10 Most Expensive Military Planes #4

     P-8A Poseidon: $290 million

Boeing's spruced-up military version of its 737 jet will be used by the Navy to conduct anti-submarine warfare and gather intelligence. It can carry torpedoes, missiles, depth charges and other weapons. The P-8A is expected to go into service in 2013.

FULL P-8A SPECS HERE