With Photoshop it is now vey easy of course to 'edit' images and present photos that may be totally different from reality! However, long before Photoshop existed this also happened.
Attached two nice examples of 'reworked' photos:
-Original F-84A Thunderjet press release photo from Republic reworked by KLu Public Affairs to represent a Dutch plane.
-Photo of the XF-104 Starfighter prototype with J-65 engine, short fuselage and intakes without the shock wave cones. Luftwaffe markings are fake. Also wing-tip Sidewinders are fake.
Most of the times you can see it, but there are also some nice cases of 'perfect' forgery!