I understand there may be some instances where predator control is necessary. I'm not an absolutist on this point. Doing it from low flying aircraft, however, is just barbaric. The wolves suffer needlessly because hunters simply wound them more often then not firing from an airplane. This is what Palin has pushed for.
Here is a video from Defenders of Wildlife that shows the method (it's under 3 minutes).
Here is more video from Current on the subject (this one is a full 10 minutes), but explains how this is mainly for the benefit of trophy hunters, not subsistence hunters that Palin claims it is for. It's worth watching.