The Oklahoma City sonic boom tests, also known as Operation Bongo II, refer to a controversial experiment in which 1,253 sonic booms were carried out over Oklahoma City, Oklahoma, over a period of six months in 1964. The experiment, which ran from February 3 through July 29, 1964, inclusive, intended to quantify the effects of transcontinental supersonic transport (SST) aircraft on a city. The program was managed by the Federal Aviation Administration, which enlisted the aid of the National Aeronautics and Space Administration and the U.S. Air Force. Public opinion measurement was subcontracted to the National Opinion Research Center (NORC) of the University of Chicago.