This photo has been discussed many times. There is another shot of the same display from a different angle by another photographer on Airliners.net. A.net screeners may not be perfect, but I find it very difficult to believe that two separate photos that had been edited so as to remove the gear from a taxiing aircraft (not exactly a minor edit) would have not only passed the airliners screening team, but also the no doubt countless people who have since examined the photos so far. Truth is, if that was fake it would not be on that site anymore; convincing fakes have been uploaded in the past and they rarely last more than a week on the site.
Edit - Here it is from another angle:
http://www.airliners.net/open.file/1027487/L/Weimeng is a very well respected photographer on Airliners.net, I have no reason to believe he would collaborate with another photographer to produce a fake.
Edit 2 - In fact, here it is from a third photographer:
http://www.airliners.net/open.file/1032835/L/