An Aileron is one of the Whistimmu, or creatures of the Tempest, found in Wraith: The Oblivion. There is not much to the body of an Aileron; a suctioning mouth full of hooks, a long, whip-like tail, and large wings that they use to glide along the Tempest currents are all they consist of. It is their thin bodies and their coloring that make them nearly invisible in the swirling debris of the storms.
Ailerons have one point to their existence: eating. They gather in groups, usually around Byways, and attack unsuspecting travelers, using their mouths to syphon Corpus and Pathos from their victims. Their tails are used to tangle their victims, but can also slash through the Corpus of those who fight back; the latter property makes Aileron tails a sought-after prize for the Ferrymen, who collect the tails and use them to make special whips.
Ailerons have no specific origin; they have existed since wraiths came to the Shadowlands, and were present in large numbers just before the Sixth Great Maelstrom, in spite of several organized attempts to destroy them.