Isn't the temperature constant above like 36000 feet? If the temperature is constant above a certain altitude then how can the temp change when an SR-71 is flying above that specific altitude were temp does not change? Apparently the unclassified material says that the SR-71 can fly mach 3.2 usually it goes a little faster or slower due to the temp but how can that be if the temp does not change above 36000 ft? Or it could go Mach 3.2 to Mach 3.3 when authorized by the commander even though it could probably routinely cruise at Mach 3.25 on standard day temps.
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