The US used U2 spy planes, first deployed during the Cold War, to monitor the Chinese balloon, as reports suggested that similar balloons were spotted previously in two more highly-sensitive military sites - but the intelligence community classified them as .The U-2S Dragon Lady spy planes were enlisted as part of because they are able to fly at extremely high altitude.The balloon was at 60,000ft, and U-2S routinely fly above 70,000ft: most fighter jets fly at an altitude between 45,000 and 51,000ft.
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