This video by Patrick Roddie has the description: "Close up of unmarked chemtrail sprayer over San Francisco, 12-30-13 " At 1:00 into the video, there's a fairly clear shot Contrast enhanced, there's a clear marking on the wing to the pilot's left (right on the photo). Compare to a similar photos of a (marked) A380: http://www.flickr.com/photos/66303308@N00/8070591423 Or this one (different plane) http://www.flickr.com/photos/66303308@N00/8625687270 Conclusion: It's just an ordinary A380, with the number in the usual place, and standard body and grey wings underneath. You can't see the side or the vertical stabilizer. Nothing "unmarked" about it. Given the more central placement of the number, and the slight cyan blue coloration on the sides and tail, I'd say it matches this Korean Air A380 HL7613 (or similar) quite well. I took this photo April 28th 2013, in Los Angeles.