In the exchanges, no one seemed particularly surprised at the speed, just that it was relatively fast. So my WAG would be like mach .8 to .9 maybe? The anomal

In the exchanges, no one seemed particularly surprised at the speed, just that it was relatively fast. So my WAG would be like mach .8 to .9 maybe? The anomalous thing they were focused on was that it wasn't squawking a transponder code, wasn't in radio contact, and possibly that it wasn't being well-tracked on primary radar.