Answer:In the film, it's a phrase used to describe the job of an air traffic controller. They're responsible for maneuvering the airplanes around in the skies. "Tin" refers to the airplanes and they're moving, or "pushing", them around. I tried to find if this was a real reference or phrase used in air traffic controllers prior to 1999, or just made up for the movie. It seems it's a phrase made up for the movie (but I can't say for certain as I have no experience in that field).
Answer: In the film, it's a phrase used to describe the job of an air traffic controller. They're responsible for maneuvering the airplanes around in the skies. "Tin" refers to the airplanes and they're moving, or "pushing", them around. I tried to find if this was a real reference or phrase used in air traffic controllers prior to 1999, or just made up for the movie. It seems it's a phrase made up for the movie (but I can't say for certain as I have no experience in that field).
Bishop73