The Air Force’s Thunderbirds are known for precise flying maneuvers at high speeds. But last week, Chicago residents said that the demonstration team’s jets broke windows on some local skyscrapers by breaking Mach 1 during practice flights for an airshow.

The Air Force insists the F-16s flown by the Thunderbirds did not go supersonic during their flights, and therefore could not have created window-shattering sonic booms.

“Regarding the [August 15] practice, the team and embedded higher wing leadership reviewed avionics data and official flight documentation,” said Air Force Maj. Krystal Jimenez, a Thunderbirds spokesperson. “Data show the speed, path, and elevation were consistent with the previous two practices at the same show location. All data confirm the aircraft did not go superso

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