In the scene when swamp thing is taking the transponder out of the airplane, all the wires are multi-colored. I happen to be an aircraft mechanic and I can tell you that all the wires in almost all aircrafts are white and in some areas of planes some wires are blue and that's it. The reason for this is because there is so much wire in an aircraft, especially an aircraft that size, the weight of the dye on the wire alone would keep the plane from ever taking off. This is a little known fact, but I like to point it out. I've seen it in many other movies with aircrafts as well such as "air force one". Also I'd like to point out that without the transponder the aircraft can still be tracked by a radar and other devices.