Identification of small fuzzy flying insect (pic)
To me, it looks like a male Aphid (males are winged, and have four wings) from the genus Eriosoma (wooly aphids). The white feathery substance is a wax secretion.   

Have a look at Bugguide: Eriosoma, InfluencialPoints: Eriosoma and this page from the Uni of Minnesota for some more info.

A picture of a species from the genus: