Retired aerial mapping pilot here.
Is not satellite photo but normal aerial mapping shot.
Yes, stitching gave you the double aircraft image.
Quite normal to map over , under, around normal airline traffic. Needs to be a lot of advance planning, coordination etc.
I have mapped DFW several times. Once, doing the Trinity River from Ft Worth to Dallas we even had our own dedicated controller. Took weeks to set up and several trips to to the tower and RADAR room and duplicate maps etc…
I had to have a safety observer who only looked for other aircraft in our co-pilot seat, etc.
I also mapped the McMurry building in OKC the next day. Had to meet with the feds at an OKC airport first. We did it at their request.
Have done all around O’Hare and many others.
Many strange effects found in aerial photos. If you have access to the original negatives, you can usually figure out how they happened.
In the OP’s link, you can see in part of the field below, the line that shows up running left - right between the aircraft where the two photos join.
The actual negatives for those pictures were taken at 10,000 feet or less and probably lower. Looks like a Wild camera instead of a ** Ziess** as that effect is more likely with their sideways negative advance instead of instead of the fore - aft advance that Ziess uses.
Due to sun angle and the images being near the edge of the negatives, the shadows very easily may not be visible.