i don't get it. >> kroft: kevin mcbride was a blackwater pilot in afghanistan, who had flown to farahany times. you wouldn't have taken that route? >> mcbride: no, you don't fly up a box canyon that rises rapidly into a huge mountain. that's just, you know, aviation 101. >> kroft: and because blackwater was unable to track the flight, and didn't have anyone on the ground in farah, it took them five hours to discover that their plane was missing, and only then because a sergeant waiting to be picked up by blackwater 61 at the desolate airstrip notified his superiors that the plane was hours overdue. >> mcbride: right away, we're thinking, well, geez, they must have got shot down or had an engine failure or something. and i just... i had no idea, and neither did anyone else. >> kroft: it was mid-afternoon before search and rescue teams were in the air, but they didn't know where to look. they covered the more logical southern route to no avail. it wasn't until the next morning that a weak homing signal was picked up by a military plane west of bagram and the wreckage was spotted, a tiny