Boeing C-137 Stratoliner procurement of the Boeing 707 was very limited, amounting to three Model 707-153s designated VC-137A. When delivered in 1959 these had four 13,500 lb (6123 kg) dry thrust Pratt & Whitney J57 (JT3C6) turbojets; when subsequently re-engined with 18,000 lbf (80.1 kN) dry thrust TF33-P-5 (JT3D) turbofans they were redesignated VC-137B. Only one other variant served with the USAF: this was the VC-137C "Air Force One" presidential transport, the two examples of which were Model 707-320B Intercontinentals with specialized interior furnishings and advanced communications equipment. Two further non-presidential C-137C aircraft were later added. To supplement its VC-137s, the USAF converted
Barack Obama on social media hashtag #AskObama, it took Obama 3111 characters to respond. The event was moderated by Twitter executive Jack Dorsey, and Obama started the session with a sample tweet to himself through @WhiteHouse that said "in order to reduce the deficit, what costs would you cut and what investments would you keep – bo". Dorsey said afterwards that Twitter received over 110,000 #AskObama-hashtagged tweets. Boehner was quite active with his questions from the outset. Some in the media proposed May 24, 2012, as the date when Obama became the first President to respond to questions on Twitter. On July 29, 2011, during