Why do some US Air n-numbers not track with flight?

Example AWE3351 (airborne now) is N812MD which tracks as not having flown since arriving from Brazil nine years ago.
Thanks

Clocking device…

Some airlines provide the information some done. WN does. US doesn’t. Search the groups and you’ll find a plethora or ways to find the information.

Note that that flight is operated by Republic, not US Airways.

Note I meant cloaking not clocking… it was sleep deprivation and wine…