https://www.reddit.com/r/TensionInTheAir/comments/1chowbg/more_evidence_to_support_the_jet_theory/
"Its tape corruption. The song in probably from the 80's and even in 2006 the tape is 15-20 years old. tho its not confirmed, that's the most likley scenario.I think this song is about airplanes You know why at the end a jet sounds flying