Essentially, for the Yukon balloon, there was a restricted operating zone that was established, which is normal operating procedure for NORAD whenever there is an incident like this, where an investigation has to occur.
For the first event, which I think you referred to as well, airspace would not have been shut down because the reported altitude of that first surveillance balloon, which we know came from China, was at 60,000 feet approximately, well above civilian traffic, therefore traffic would not have to be curtailed. The one in Yukon did pose a reasonable risk to civil aviation. Restricted areas were established in order to ensure that people stayed away from that.