Criticism of the Space Shuttle program costs through amortization. Development costs were expected to be recouped through frequent access to space. These claims were made in an effort to obtain budgetary funding from the United States Congress. Beginning in 1981, the space shuttle began to be used for space travel. However, by the mid-1980s the concept of flying that many shuttle missions proved unrealistic and scheduled launch expectations were reduced 50%. Following the "Challenger" accident in 1986, missions were halted pending safety review. This hiatus became lengthy and ultimately lasted almost three years as arguments over funding and the safety of the program continued. Eventually the
Space Shuttle Endeavour Manchester Boulevard Bridge. The space shuttle was mainly carried by four self-propelled robotic dollies throughout the 12 mile journey. However, due to bridge weight restrictions, the space shuttle was moved onto the dolly towed by the Tundra. After it had completely crossed the bridge, the Space Shuttle was returned to the robotic dollies. The footage was later used in a commercial for the 2013 Super Bowl. Having taken longer than expected, "Endeavour" finally reached the Science Center on October 14. The exhibit was opened to the public on October 30, 2012 at the temporary Samuel Oschin Space Shuttle "Endeavour" Display