Q. Evergreen Air Center is the world's largest parking lot for undesired commercial aircraft. Airlines pay from $750 to $5,000 monthly for the storage services provided by Evergreen. Prior to September 2001, the company had 140 discarded airplanes at its Arizona facilities and was growing at a rate of about six planes monthly with about two a month sold for parts and/or scrap metal. After calamity struck the airline industry in September 2001, the airlines have retired over a thousand planes—many of which found their way to Evergreen. Now the actual number of planes stored at Evergreen differs significantly from the prediction based on previous behaviour.