From publisher blurb:
Letters from the Flaming Crab is a monthly series of Pathfinder-compatible supplements. Each Letter focuses on exploring a different topic to give gamemasters and players new, exciting options that can be dropped into any campaign.
Welcome to our first issue: Winged Cavalry! Our team of writers brings you the master of aerial combat: the wind warden, an alternate class for the cavalier. And 4 orders for the wind warden: the order of the feather (pegasus), order of the hunt (pteranodon), order of the spire (magic carpet), and the order of talon and mane (griffon). In addition, we have a few advanced flying maneuvers in the book. "Do a barrel roll!"