 Jeb obviously has a strong ex post complaint against any principle permitting flying. But he also has an ex ante complaint. Even before he knows that he will be killed by falling debris, Jeb expects no benefit whatsoever from flying. (Indeed, he does not regard flying as truly beneficial to anyone!) Jeb will want to reject in advance any principle that imposes on him a risk of death without any compensating benefits. From a contractualist perspective, this rejection seems reasonable.