what happend here? got lost 
The flight left FA’s service area.
Another leased 757 on delivery to Ethiopian?
Any way to find out the serial number?
Delivery flight of ex-ATA aircraft.
There was another one last month: b757.info/CN/27976.htm
I’m guessing this one is ex-N522AT which was also last reported at KVQQ but now has an Ethiopian tail number. If you monitor the site above it may eventually get reported.