This was a very lucky shot. I did not know the plane was there and it was only in front of the sun for about six seconds. Note also the two sunspots above and below the trail.
Nikon P900 @ 2000mm
Date Time Original: May 19, 2017, 7:47:19 PM (PDT, so 02:47AM May 20th UTC)
Approximate photo location: 38.63°, -121°
It presents an interesting geolocation opportunity for identifying the plane, due to the precisely known location the the sun at any time.