Fantastic Crests of the Middle Ages :
A pair of wings is called the “flight” (in English heraldic language : “Vol”, like in French); a single wing is called a “half flight”. Normally the low ranking nobility used this simple heraldry symbol, but this was not always the case. The Viscount of Thouars (then Louis d'Amboise) used the “flight” with a crown adorned with gems.
The use of ornamental feathers or even complete wings are found in all cultures, from the American Indian’s headdress to the long curved poles full of feathers of the "Winged Polish hussars." Even the bowmen of Charles the VIIth’s personal guard wore a tricolor colored feathers of green white and red.
But wings also represent ascent towards the Gods (see the myth of Icare). In biblical culture, wings are attributes of the angels and also the symbol of saved souls flying off towards Paradise.
Étienne de Vignolles, called "La Hire", used a full “flight”, “vol”, or double wings for his crest; the wings and mantled are according with the arms’ colours, Argent and Sable (coat-of-arms: Sable three bunches of grapes Argent).