Cool! This works. Had to scroll all the way to the bottom of the object tab panels to find “Ray Visibility” though. There are also check boxes for Glossy, Shadow, Diffuse and Transmission, so it is more than just the visibility to the camera.
@pdxDaniela, I tried the different layer approach. It didn’t work. If the emitter plane layer is not visible, the light won’t illuminate things on the visible layers.
Now, about that other problem. The only thing in the image to compare the drone to is the wing of the airplane. The drone appears a lot ‘sharper’ because it is CG while the plane wing is a photograph probably from a small resolution hand held camera. You need to reduce the apparent resolution of the drone to make it look like it fits into the shot. Perhaps some DoF adjustments to make the drone look fuzzier?