Try hanging out around the American Eagle gates on a Friday or Saturday evening. I've been there when it seemed as though every 3 minutes you heard an announcement (that they try to make sound off the cuff, but is obviously read from a handbook) saying, "For those passengers in the gate area for flight XXX, we are in an oversold situation....." I've given up my seat on a flight for a voucher only to be bumped off the next flight (for yet another voucher.