Like I said, not complete invulnerability. However, it's clear there has to be some measure of protection.
So, he can't go at full speed, and if someone was shot while he was holding them, they'd be hurt.
On the other hand, if someone is falling, and has already fallen 40 stories, and he rushes in at super speed and catches that person, you'd normally expect that to be a fatal impact. Since we've seen him do this, and since the person caught was unharmed, we have to assume there's something going on. Also, he can fly with someone at high speed (not full speed but pretty fast) without damaging the passenger. Unlike in a car or a plane, there's no windshield involved. There are other examples. His passengers survive a lot more than you'd expect them to without help.
So, I stand by my conclusion. A passenger doesn't get the full benefit of his aura, but does get some measure of protection.
Paul
