Okay, so it's bad enough that Miami International Airport is always under construction, and the parking situation is confusing at best and miserable at worst. But Magic City dwellers suffered one more airport-related indignity last year when it was revealed that the long-awaited airport train is $1.5 billion over budget and that its train cars are sitting empty where they were manufactured, in Japan. Yes, Japan. In April 2006 the county commission approved spending $1.98 million to "exercise" the train cars (in Japan) over the next two years. The cars can't run here in Miami because the tracks aren't ready yet. "I think some mistakes were made," John Cosper of the Miami-Dade Aviation Department told NBC News. Ya thinkç