Near the end of this song is an aural collage of shortwave radio noise. Morse, teletype, and various data signals can be heard including a radio modem (called the Harris RF-5710) used by hobbyists and naval military services. The Morse code heard at 05:20 decodes to "CQ de GM3DP" (a Scottish callsign).
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Trivia
"Slow This Bird Down" is pilot jargon for reducing speed during a landing.