What flying bug has a black body and two red heads?

The insect you are describing could be the "red-headed wasp" or a similar species of wasp that may have a black body and distinct red markings. However, it's essential to note that many flying insects can have variations in color and appearance. If you're observing this bug in the wild, it might be helpful to consult a local entomologist or an insect identification guide for a more accurate identification.