When a non-refundable ticket is changed, not only does US Airways charge a $150 change fee ... but if the new fare is lower than the original fare THEY KEEP THE DIFFERENCE (it is "absorbed, " as the representative stated). However, if the flight is more expensive, they charge you. In my opinion, this is theft pure and simple. I can see not crediting you back any more than the $150 change fee but at the very least the difference you are due should be deducted from the change fee. I just don't know how they get away with this. I don't know if any other airlines do this. That's why I fly Southwest whenever I can. Southwest is an airline with integrity. I've told all of my employees not to fly US Airways unless there are no other reasonable options.