A person who flies an aircraft, or a printed leaflet/advertisement distributed to promote something.
From 'fly' (Old English 'fleogan') plus agent suffix '-er.' The word developed two meanings: one person who flies, one paper that 'flies' or spreads through communities.
The word 'flier' is spelled two ways—'flier' and 'flyer'—and both are correct! But fun fact: in aviation, pilots strongly prefer 'flier' because 'flyer' is used for the advertisement meaning, so they feel 'flier' belongs to them.
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