Boeing Poseidon gets test flight

The third of Boeing's new P-8A Poseidon sub-hunting aircraft took to the air over Washington over the weekend for its first test flight.

The P-8A is a militarized version of Boeing’s popular 737 jetliner. The new plane is built on a separate assembly line from the 737 at Boeing’s Renton plant.

The plane flew for nearly three hours before returning to Boeing Field.

In the next few weeks, the plane will fly to Naval Air Station Patuxent River, Md., for further testing. The Navy will be buying at least 117 of the aircraft from Boeing to replace its fleet of aging P-3 Orions.