U.S. Air Force's F-22 Raptor Fleet Still Grounded

Two F-22s

Despite $65 Billion Investment, World's Most Costly Jet Still Grounded -- Syracuse.com

The most expensive fighter jet ever built, the U.S.’s F-22, has not only sat on the sidelines in Iraq, Afghanistan and Libya — the entire fleet has been grounded indefinitely since early May due to a problem that’s caused some mysterious symptoms for pilots.

Wired notes that if this doesn’t change in the next few months, the Air Force’s F-22 pilots will need to be retrained on how to fly the jets:

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Update: USAF officials conduct study of F-22 oxygen generation systems -- Defpro

My Comment: After being grounded for four months .... eyebrows and more questions are now being raised.