V shaped craft large lights silent huge and took ten minutes to pass covered sky.

This information come from my sister and it was on the news. A V shaped huge craft flew over silently with lights like in the Phoenix lights.  She stated it took several minutes to pass over Thompson Park and it covered the entire sky above them.  There were several people who saw the event.  It was a big news at the time.  They news stated that it was helicopters operating in the area.
Witness indicates that the date of the incident is approximate.  PD