While watching vapor trails of various planes flying over head during a cloudless late afternoon, a tic tac shaped object was observed going from the se to the nw. it passed under an airplane that was traveling toward the east. the object made no sound and had no observable wings. it was well lit by the sun and was reflecting light making the object appear white. there was no visible vapor trail behind the object and it was flying lower than most of the planes but higher than some that had passed overhead earlier. it passed directly over our heads and it was moving at a rate of speed comparable to an airplane, possibly a bit slower. we observed the object until it disappeared behind our tree. we frequently observe small planes in the area and some small private jets due to an airport nearby. however, this was not one of those planes as they are either propeller driven, jet driven or a combination of both with distinct sound. there were no jet engines visible nor any type of propeller, which would have produced sound. this object did not. it had no windows that we could see.