99% of people think these are the same aircraft... they're not.
The A-12 was actually lighter, faster, and flew slightly higher with length of 101 ft 8 in (31.0 m), while the SR-71 traded a bit of performance for a second crew member, more sensors, and much greater operational capability with length of 107 ft 5 in (32.7 m). Both did Mach 3+
Only 15 A-12s were ever built, making it one of the rarest aircraft ever created.
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