This was not a typical sluggish wayward Cessna 152 or 172 with a cruise speed of 122 knots that tend to violate airspace by ignorance. The Cessna 560 Citation V Business Jet cruises at 430 knots/Mach 0.755 and can probably fly faster. I wish news articles would include the model family in the headline.

At Mach 0.755 with supersonic barrier being at Mach 1.0, it becomes obvious why it had to be a supersonic intercept.