They wouldn't tell us if they were, that information would almost certainly be highly classified. Compare the balloons with this technology: https://en.wikiped

They wouldn't tell us if they were, that information would almost certainly be highly classified. Compare the balloons with this technology: https://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird#Operational_history https://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird#Opera...