Flyer is the Land Before Time term for pterosaurs, and other flying creatures such as birds. The most widely depicted flyers in The Land Before Time are Petrie and his family. The adult flyers tend to be smaller than most adult dinosaurs, however they usually range in size around the smaller dinosaurs.
Most flyers are (incorrectly, in the case of pterosaurs) depicted as twofooters, though, in some very early films, they (particularly Petrie in the first two series installments) are depicted as faculative quadrupeds, much like many ornithopod dinosaurs.
Most flyers are herbivores or omnivores, but some, such as the "sharptooth flyer" that appears in The Land Before Time V: The Mysterious Island, are carnivores.