Maybe the sound is produced only at certain air speeds or during certain air manoeuvres? For example, the F-104's magnificient howl was only heard if the aircraft flew fast and short above the ground.
 
Tu-22M3

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Upgraded Project 11442M Orlan/Kirov class nuclear-powered battlecruiser Admiral Nakhimov will become the flagship of the Russian Navy. Admiral Nakhimov should return to active service at the end of 2022. Source: SEVMASH Shipyard.
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