I just looked at maps.Google.com and they seem to date from sometime after July of 2012 based on the status of terminal 3 at McCarran. Those images start with the satellite view at a distance but when you zoom in they switch to what I assume was an airplane flyover as it shifts from directly overhead to one with a slight angle. In both the higher and lower images terminal 3 is open, and its opening date was June 27, 2012. That also meshes with the only other reference point I could think of; wet n wild. In both images wet n wild is just a barren lot, and from an image in a news article they seem to have started construction in October of 2012.
If you wanted to find a closer date for when the flyover appeared Terminal C might help in determining that. If you zoom in on it the view switches from one with airplanes at the end to one where the end gates are having construction and the tarmac is torn up. If you can figure out when that construction took place you could get a more definitive date for when the image was taken.
