There's a curious image and brief video at http://spaceweathergallery.com/indiv_upload.php?upload_id=130105 showing an arc of something above the wing of a commercial flight. No flight details were reported.
Taken by Shiraishi on October 10, 2016 @ Over Japan Sea
Details:
Something like...
What makes the trails form at the wing tips in this video, but none at the engines?
I have seen some other trails at plane wings, but they were around the planes wing flaps.
