Summary and Key Points: The U.S. Air Force originally planned to build 381 F-22 Raptors. Only 187 were built. Approximately 120 are combat-ready today. The aircraft was designed in the late 1980s and early 1990s around the Intel i960 processor architecture — a closed system where adding capabilities often requires millions of code changes rather than a simple patch.
-The F-35, by contrast, uses Open Mission Systems for modular upgrades. The Raptor is rated for 8,000 hours of certified airframe life, and the small fleet has burned through hours faster than expected.
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