Message posted by jklier on December 02, 2016 at 7:30:30 PST:
I was observing a Janet flight to Groom on Flightradar this morning. Shortly after takeoff there was another aircraft flying the same path to the southwest at 14000 feet. Occasionally this aircraft would overtake the Janet and then drop back again. Just north of Indian Springs it disappeared. The callsign on this aircraft was www621. Just curious if this was a military jet or just an anomaly on the site? The linked image shows the Janet marked as No callsign. This was about the point that ww621 disappeared.
Attached link: Janet and companion
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