In 2006, an F-18 cut a demonstration lap at Reno's unlimited 9 mile long course. At sea level on a standard temperature and pressure day, the speed of sound is 750mph. At 5,000 feet elevation and a slightly warmer dryer day, that speed gets closer to 700. This F-18 averaged 657mph and we can hear that overpressure bump as it flys past on the main straight as it gets riiiight there to the barrier, but not quite through.