I'm curious if any type of flying animal that ever existed would have been able to carry your average 150 pound man.
Assuming that the heaviest pterosaurs (Quetzalcoatlus, Hategopteryx) probably weighed around 200 kilograms... No. This extra load would have required a huge amount of extra muscles and the forces acting on the wing bones (which are the distal phalanges of the 4th finger) would be too high.
The biggest bird was Teratornis incredibilis with an estimated weight of around 25 kilograms... This should answer your question.