Navy orders 11 Boeing sub-hunters 22 (UPI) -- The U.S. Department of Defense said it has ordered 11 new jets from Boeing Co. at a cost of $1.9 billion. The contract is an extension of a previous contract, which produced 13 P-8A jets for the U.S. Navy that are designed to search for submarines, The Wall Street Journal reported Saturday. The Navy has already said the contract is likely to extend to a total of 117 P-8A jets which would replace its aging fleet of P-3 Orion propeller planes. The P-8A is a single-aisle jet that is a modified 737-800 jet, the Journal reported.