Probably more than that. Heck the F-16 can pull 9-Gs when everything is working. The airplane might be able to do more than that, but that pilot can't without blacking out. Most people will black out at even lower G levels, but pilots have special gear and special "straining" tecniques to increas their G tolerance. The fact that the F-16 seat leans back quite a bit also helps, by shortening the "vertical" distance between the heart and the brain.