I like to fly Airtran with my EarlyReturns number. When I come home, I almost never receive credit. I Email EarlyReturns and wait, but nothing. Then, I give them a call. Ultimately, you may end up with double credit.

1) It may not work every time.

2) I did it in good faith since I hadn't received credit in a timely fashion after the flight or after the initial contact.

Good Luck!