flight "ZQX"

on website such as passur, some flights (bizjets) and the prefix ZQX. Who owns them?

Found this on the Nantucket AirportMonitor site:

Privacy Filters

  -  FAA requires that we remove the aircraft identification of certain General Aviation aircraft who have been granted a privacy waiver. These would typically be identified on AirportMonitor by 'tail number' (such as N1234). Instead, these privacy-protected flights are identified as 'ZQX.'
  • All the other information about these flights, such as aircraft type, altitude, origin and destination, will be available as normal on AirportMonitor.

That should be what you’re looking for.

BL.

ahh that must be why. Thank you.