UNITED stopped using 747s 7 months before Q drop 1679. Can planefags identify the United 747 in Q drop 1679? United only had 44 747s in various configs. This one may be odd in that the upper deck windows are either blocked by the window frame, or there aren't any. This could eliminate a large portion of the fleet, if we exclude the cargo variants which have no windows.
If the 747 in the Q pic has windows below but no windows for the upper deck it would make the plane very different from the normal passenger variants.
Btw