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The Pilot Wife Life Blog: https://thepilotwifelife.com/united-airlines-presents-flight-3591-widow-with-wings-and-epaulets-leaves-indoc-seat-vacant/?fbclid=IwAR1zuc3RpiYB6m0RBxkOhlhlKGzHjzMPNjvvr5iX_5S9q827pQ8GpBAQ1dw 

Flying Magazine Article: https://www.flyingmag.com/purdue-alums-create-radio-communications-simulator 

Plane English: https://www.planeenglish.net