In an AP news article there's a quote from a politician stating:
“This is not the first time a Chinese balloon has entered American airspace over sensitive national security areas,” Daines said in a Friday statement to the AP. “I don’t think anyone believes this was merely a civilian aircraft.”
Of course trying to google for these other events only turns up pages and pages of results about this latest incident in 2023 so I'm curious as to the other occasions mentioned in the quote.