Is this photo showing dozens of airliners in close proximity real, or even plausible? CNN has an article about Heathrow that's accompanied by the following photo:



Is this photo depicting an actual event?  If not, would it even be possible/plausible to fly this many airliners this closely together or would wake turbulence and similar factors make this basically impossible?

It looks like several of the planes may be in the process of either stowing or deploying their landing gear, and also have their flaps deployed.  Does this indicate that maybe someone has photoshopped together a bunch of photos of planes landing to produce this image?
The image is a composite image of 42 planes taking off from Heathrow over a one-hour period on November 2, 2016.  Here it is on Getty Images if you want to license it for your own purposes;  it is credited to Dan Kitwood.