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All F-22 Raptors Have Been Grounded Since Early May
Several pilots have reported problems with their oxygen supply, and some near crashes have resulted blamed on hypoxia.

Since January, Raptors have been prohibited from flying higher than 25,000 feet since a training accident in Alaska. The Air Force has more than 160 F-22 Raptors in its fleet and plans to build a total of 187.

In 2007-2008 all F-15 fighters were grounded for four months after one aircraft fell apart in flight.
Posted by: Anonymoose 2011-06-26
http://www.rantburg.com/poparticle.php?ID=325236