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The reason the author wrote this book came from visiting air traffic control system at Milwaukee, Wisconsin, with a student. No one checked their identity; nor were there any security people present. The author went home at lunchtime and wrote the first ten pages, showing his concern of what just happened.

Produktbeschreibung
The reason the author wrote this book came from visiting air traffic control system at Milwaukee, Wisconsin, with a student. No one checked their identity; nor were there any security people present. The author went home at lunchtime and wrote the first ten pages, showing his concern of what just happened.