After the shock and horror of 9/11 came a second shock: the al-Qaeda hijackers practiced their flying skills at U.S. flight schools.  Imagine being an instructor who unknowingly trained the terrorists.

FOX News Radio's Eben Brown spoke to one of them, and reports  in Part 15 of our month-long special series, "9/11: 10 Years Later":

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In our next report, Afghanistan's struggle to kick out the terrorists.

CLICK HERE to listen to Parts 1-14 of our month-long special series, "9/11: 10 Years Later"