Here is a picture I took yesterday at the Dryden Aircraft Operations Facility at Air Force Plant 42 in Palmdale, California.
This is one of the two existing Shuttle Carrier Aircaft (SCA). This one is aircraft N911NA. The other SCA (N905NA) was spotted by a friend at Washington Dulles Airport the next morning, with Space Shuttle Discovery mounted on top. (Discovery is being delivered to the Smithsonian Air & Space Museum. N911NA is now officially retired at Dryden. It will be used as a “donor” for spare parts for SOFIA).