chronicle - How did the jet airplane knock one of them out?

This is possibly a plot hole.

To be knocked out, he would have to have been hit by the plane.

But a commercial airliner flying at that height (around 1000 feet) would be doing at least 150 knots (290 km/h or 170 mi/h) which would obliterate anything.

But by this time we've seen that the boys are able to protect themselves with their "powers". It may have been that their powers weren't quite strong enough to protect them from the full impact with the plane resulting in one being knocked out.