Max is assigned to protect CONTROL Courier Busby during a plane ride, but he mysteriously disappears from the bathroom in mid-flight. Max becomes the next courier and 99 works as a flight attendant to discover how KAOS is kidnapping the agents. After drinking twelve cups of coffee, Max discovers that the bathroom has a trap door in the floor and that's how KAOS is eliminating the couriers. Two scenes really make this episode stand out in my mind. The cockpit fight with the No Smoking sign and 99 searching Shandar the Magician are laugh out loud funny.

The title is based on the Oscar-winning foreign film Closely Watched Trains.