A pilot looking down and to the left from 40,000 feet saw this white cigar-shaped object seemingly following him, and took a video with his phone.
Lucklily the original file was uploaded to the MUFON database, and it had both a timestamp, and GPS location!
File Modification Date/Time : 2020:01:29 08:00:51-08:00 GPS Coordinates : 37 deg 13' 2.64" N, 113 deg 3' 31.68" W
So the photographer's plane was a private jet at 40,000 feet. The white object is United 541, a 737 at 25,800 feet, descending towards Las Vegas.