The FIRST wings in Second Life that work realistically. In short, these wings flap when you press the jump key, giving you upward lift, and forward speed if you are gliding. These work completely *outside* of SL's built-in flight system, using a pseudo-physics engine. Come check my shop in Aesthetic for more information on how they work.
So far, they can be purchased in either white or black, and the wingspan is about 7 meters from wingtip to wingtip when in flight. They move realistically, and every motion while using the wings is fully animated, as this flight is, again, not normal SL flight. With these wings, you'll likely enjoy flying around again, just like your very first day in SL when you took to the air, as it takes actual timing and a little practice to fly accurately, and get used to staying in the air with even strokes of your wings.
Happy flappin'!
~Ani