The author concludes that radiation absorbed by commercial airline flight crews will do them negligible harm since the radiation one absorbs during a commercial flight is no more dangerous than the radiation one absorbs during a normal dental X-ray, which does negligible harm.

The author reasons that since the radiation absorbed by someone on a commercial flight is no more dangerous than the radiation absorbed by someone during a dental X-ray, which does negligible damage to a person, commercial airline flight crews will be negligibly harmed by the radiation they take in on commercial flights. However, a flaw in this argument is that it fails to consider that members of these flight crews will likely fly on many flights, and the radiation damage from many flights could stack up over time, possibly doing them harm.