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Animation by Josh Sherrington
Sound by Graham Haerther (http://www.Haerther.net)
Thumbnail by Simon Buckmaster

Music by http://epidemicsound.com
Select footage courtesy the AP Archive

References:
[1] https://www.eurocontrol.int/ne....ws/celebrating-100-y
[2] https://hub.united.com/2020-03....-17-united-airlines-
[3] https://docs.google.com/spread....sheets/u/0/d/1cRgtHZ
[4] http://media.corporate-ir.net/....media_files/NYS/UAL/ https://americanairlines.gcs-w....eb.com/static-files/ https://d1lge852tjjqow.cloudfr....ont.net/CIK-00000279
[5] http://ir.united.com/static-fi....les/1dc3696a-8b66-48 https://americanairlines.gcs-w....eb.com/static-files/ https://d18rn0p25nwr6d.cloudfr....ont.net/CIK-00000279
[6] https://www.economist.com/fina....nce-and-economics/20