Day Treading: KC-135 take-off
A KC-135 Stratotanker takes off for a mission at Transit Center at Manas, Kyrgyzstan, September 6, 2013. The KC-135's engines consist of four Pratt & Whitney TF-33 fan-jet engines, each weighing 6,100 pounds, and capable of developing 18,000 pounds of thrust. At 60 degrees Fahrenheit and full throttle, each engine consumes 10,250,000 cubic feet of air per hour, the equivalent of the air contained in a building 300 feet long, 100 feet wide and 34 stories tall. (U.S. Air Force photo/Staff Sgt. Robert Barnett)