Chay Yu Wei from Singapore, recently participated in a Nikon Singapore photography contest. He clearly shopped in the aeroplane, but Nikon did not check and awarded him the prize. Some people say others are jealous because they didn't win, but the truth is this is a photography contest, not a photo manipulation contest.
More info:
The location which he shot the picture, Chinatown, has no planes flying over at all, so there was zero chance that the plane could even be in the shot.
This is his photo:
https://www.instagram.com/p/BAXHGDRLRLg/?taken-by=yuuuuuweiThis is the link to Nikon Singapore's facebook post stating that he won the prize (The comments are hilarious):
https://www.facebook.com/nikonsingapore/photos/a.168788309841996.46849.164385193615641/945585702162249/