Air Force: 'Lingering Uncertainty' About F-22

Senior Air Force leaders still have no idea why some pilots of F-22 fighters keep blacking out mid-flight.

Senior Air Force leaders still have no idea why some pilots of F-22 fighters, the most expensive warplanes ever, keep blacking out mid-flight.

A service investigation into a string of incidents, including one death, in which pilots reported difficulties breathing due to apparent problems with the onboard oxygen system produced nothing definitive. "There is lingering uncertainty that the Scientific Advisory Board found no root causes," Air Force Secretary Michael Donley told reporters at a Thursday breakfast meeting.

But some Defense Department analysts and watchdogs want heads to roll, and Congress to launch its own probe. Read more here.

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