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General note: Addition of unsourced or improperly cited material on Mayday.
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[[File:Information.svg|25px|alt=Information icon]] Hello, I'm [[User:Doniago|Doniago]]. I noticed that you added or changed content in an article, [[:Mayday]], but you didn't provide a [[Wikipedia:Reliable sources|reliable source]]. It's been removed and archived in the page history for now, but if you'd like to [[Wikipedia:Citing sources|include a citation]] and re-add it, please do so. You can have a look at [[Help:Referencing for beginners|referencing for beginners]]. If you think I made a mistake, you can leave me a message on [[User talk:Doniago|my talk page]]. Thank you. <!-- Template:uw-unsourced1 --> [[User:Doniago|DonIago]] ([[User talk:Doniago|talk]]) 14:39, 5 September 2022 (UTC)
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:::The reference is in the linked article. The cause of the Avianca 502 accident was the crew failing to convey their situation by using the term 'Mayday'.