Didn't expect to see such an exotic registered aircraft over here.
On display in the Evergreen Aviation Museum.
Roper 10 taxiing for departure to Beale AFB.
Taxiing for departure to Boeing Field.
Arriving from KBDL.
Another Alaska Airlines departure from Portland.
Info from Wikipedia:
>The North American X-15 was a rocket-powered aircraft operated by the United States Air Force and the National Aeronautics and Space Administration as part of the X-plane ... (more)