Okay, in the attached image you see two aircrafts I made. There are two nurbs plane for the background images, one behind the airplanes and the other beneath the airplanes which I used for a reflection on the belly. Problem is there is not suposed to be a reflection of the ground on the topside of the airplanes. The reflection of the image beneath the airplanes is OK.

Is there a way to turn off the reflection of the image in the background? I tried to render the background and foreground separately and layer them on top of eachother in Photoshop, but then I get the black background surrounding the aircrafts instead of a transparent one. I set Alpha channel to on and a Targa image format in render globals but still no transparency. What am I doing wrong?