I typed in the wrong flight number and came across this tracking info for UAL54 https://flightaware.com/live/flight/UAL54/history/20180219/0137Z
Why would a commercial airline be blocked from public view and why would this flight number not match the airlines normal route?
You can go into your FlightAware user’s preferences by click on your username and turn on “position only flights”.
https://flightaware.com/about/faq#adhoc
Planes that haven’t filed a flight plan are position only.