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This Cessna T-37 "Tweet" is used as a primary jet trainer for the U.S. Air Force.  So how old are these planes?  The first T-37 was manufactured way back in 1955.  More than 1000 were built and approximately 400 remain in active service today.  In 1989, the remaining fleet was extensively overhauled by replacing or modifying all major structural components.

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