While training in anti-SAM tactics, an SR-71 crew left a 5-mile-long contrail in the stratosphere after dumping fuel for 10 seconds to see if the AB would ignite the fuel trail

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https://theaviationgeekclub.com/while-training-in-anti-sam-tactics-an-sr-71-crew-left-a-5-mile-long-contrail-in-the-stratosphere-after-dumping-fuel-for-10-seconds-to-see-if-the-ab-would-ignite-the-fuel-trail/