What does "flyer" mean?

Additional senses

1. 2.Anything that is scattered abroad in great numbers as a theatrical programme, an advertising leaf, etc.
2. 3.(Arch.) One in a flight of steps which are parallel to each other(as in ordinary stairs), as distinguished from a winder.
3. 4.The pair of arms attached to the spindle of a spinning frame, over which the thread passes to the bobbin; -- so called from their swift revolution. See Fly, n., 11.
4. 5.The fan wheel that rotates the cap of a windmill as the wind veers. Internat. Cyc.
5. 6.(Stock Jobbing) A small operation not involving considerable part of one's capital, or not in the line of one's ordinary business; a venture. [Cant] Bartlett.